Search a number
-
+
19999961 = 54736563
BaseRepresentation
bin100110001001…
…0110011011001
31101122002210022
41030102303121
520104444321
61552400225
7331665632
oct114226331
941562708
1019999961
11103202a3
126846075
1341b33c7
142928889
151b50dab
hex1312cd9

19999961 has 4 divisors (see below), whose sum is σ = 20037072. Its totient is φ = 19962852.

The previous prime is 19999927. The next prime is 19999963. The reversal of 19999961 is 16999991.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16999991 = 93718143.

It is a cyclic number.

It is not a de Polignac number, because 19999961 - 26 = 19999897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19999963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17735 + ... + 18828.

It is an arithmetic number, because the mean of its divisors is an integer number (5009268).

Almost surely, 219999961 is an apocalyptic number.

It is an amenable number.

19999961 is a deficient number, since it is larger than the sum of its proper divisors (37111).

19999961 is an equidigital number, since it uses as much as digits as its factorization.

19999961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37110.

The product of its digits is 354294, while the sum is 53.

The square root of 19999961 is about 4472.1315946649. The cubic root of 19999961 is about 271.4415852222.

The spelling of 19999961 in words is "nineteen million, nine hundred ninety-nine thousand, nine hundred sixty-one".

Divisors: 1 547 36563 19999961