61131320 has 32 divisors (see below), whose sum is σ = 145638000. Its totient is φ = 23013888.

The previous prime is 61131319. The next prime is 61131383. The reversal of 61131320 is 2313116.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44270 + ... + 45629.

Almost surely, 2^61131320 is an apocalyptic number.

It is an amenable number.

61131320 is an abundant number, since it is smaller than the sum of its proper divisors (84506680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61131320 is a wasteful number, since it uses less digits than its factorization.

61131320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89927 (or 89923 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 61131320 is about 7818.6520577399. The cubic root of 61131320 is about 393.9319971619.

Adding to 61131320 its reverse (2313116), we get a palindrome (63444436).

The spelling of 61131320 in words is "sixty-one million, one hundred thirty-one thousand, three hundred twenty".