61512987931 has 8 divisors (see below), whose sum is σ = 61980458144. Its totient is φ = 61046308800.

The previous prime is 61512987869. The next prime is 61512987953. The reversal of 61512987931 is 13978921516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61512987931 - 2⁷ = 61512987803 is a prime.

It is a super-2 number, since 2×61512987931² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61512987131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41196 + ... + 353161.

It is an arithmetic number, because the mean of its divisors is an integer number (7747557268).

Almost surely, 2^61512987931 is an apocalyptic number.

61512987931 is a deficient number, since it is larger than the sum of its proper divisors (467470213).

61512987931 is a wasteful number, since it uses less digits than its factorization.

61512987931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395541.

The product of its digits is 816480, while the sum is 52.

The spelling of 61512987931 in words is "sixty-one billion, five hundred twelve million, nine hundred eighty-seven thousand, nine hundred thirty-one".