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61913 = 101613
BaseRepresentation
bin1111000111011001
310010221002
433013121
53440123
61154345
7345335
oct170731
9103832
1061913
1142575
122b9b5
1322247
14187c5
1513528
hexf1d9

61913 has 4 divisors (see below), whose sum is σ = 62628. Its totient is φ = 61200.

The previous prime is 61909. The next prime is 61927. The reversal of 61913 is 31916.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 26569 + 35344 = 163^2 + 188^2 .

It is a cyclic number.

It is not a de Polignac number, because 61913 - 22 = 61909 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (61933) 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, 206 + ... + 407.

It is an arithmetic number, because the mean of its divisors is an integer number (15657).

261913 is an apocalyptic number.

It is an amenable number.

61913 is a deficient number, since it is larger than the sum of its proper divisors (715).

61913 is a wasteful number, since it uses less digits than its factorization.

61913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714.

The product of its digits is 162, while the sum is 20.

The square root of 61913 is about 248.8232304267. The cubic root of 61913 is about 39.5603947121.

The spelling of 61913 in words is "sixty-one thousand, nine hundred thirteen".

Divisors: 1 101 613 61913