Search a number
61969 = 311999
BaseRepresentation
bin1111001000010001
310011000011
433020101
53440334
61154521
7345445
oct171021
9104004
1061969
1142616
122ba41
132228b
1418825
1513564
hexf211

61969 has 4 divisors (see below), whose sum is σ = 64000. Its totient is φ = 59940.

The previous prime is 61967. The next prime is 61979. The reversal of 61969 is 96916.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61969 - 21 = 61967 is a prime.

It is a super-2 number, since 2×619692 = 7680313922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 1999 = 61969 / (6 + 1 + 9 + 6 + 9).

It is a Duffinian number.

It is a plaindrome in base 13.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 61969.

It is not an unprimeable number, because it can be changed into a prime (61961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 969 + ... + 1030.

It is an arithmetic number, because the mean of its divisors is an integer number (16000).

261969 is an apocalyptic number.

It is an amenable number.

61969 is a deficient number, since it is larger than the sum of its proper divisors (2031).

61969 is a wasteful number, since it uses less digits than its factorization.

61969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2030.

The product of its digits is 2916, while the sum is 31.

The square root of 61969 is about 248.9357346787. The cubic root of 61969 is about 39.5723185111.

The spelling of 61969 in words is "sixty-one thousand, nine hundred sixty-nine".

Divisors: 1 31 1999 61969