61311972 has 12 divisors (see below), whose sum is σ = 143061296. Its totient is φ = 20437320.

The previous prime is 61311959. The next prime is 61311973. The reversal of 61311972 is 27911316.

61311972 is nontrivially palindromic in base 14.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (61311973) 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, 2554654 + ... + 2554677.

Almost surely, 2^61311972 is an apocalyptic number.

It is an amenable number.

61311972 is an abundant number, since it is smaller than the sum of its proper divisors (81749324).

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

61311972 is a wasteful number, since it uses less digits than its factorization.

61311972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5109338 (or 5109336 counting only the distinct ones).

The product of its digits is 2268, while the sum is 30.

The square root of 61311972 is about 7830.1961661251. The cubic root of 61311972 is about 394.3196577883.

The spelling of 61311972 in words is "sixty-one million, three hundred eleven thousand, nine hundred seventy-two".