61531693 has 12 divisors (see below), whose sum is σ = 65915388. Its totient is φ = 57400640.

The previous prime is 61531669. The next prime is 61531697. The reversal of 61531693 is 39613516.

It can be written as a sum of positive squares in 2 ways, for example, as 2518569 + 59013124 = 1587^2 + 7682^2 .

It is not a de Polignac number, because 61531693 - 2⁹ = 61531181 is a prime.

It is a super-2 number, since 2×61531693² = 7572298486892498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61531697) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20271 + ... + 23107.

It is an arithmetic number, because the mean of its divisors is an integer number (5492949).

Almost surely, 2^61531693 is an apocalyptic number.

It is an amenable number.

61531693 is a deficient number, since it is larger than the sum of its proper divisors (4383695).

61531693 is a wasteful number, since it uses less digits than its factorization.

61531693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2924 (or 2901 counting only the distinct ones).

The product of its digits is 14580, while the sum is 34.

The square root of 61531693 is about 7844.2139822929. The cubic root of 61531693 is about 394.7901315306.

The spelling of 61531693 in words is "sixty-one million, five hundred thirty-one thousand, six hundred ninety-three".