61087760831 has 4 divisors (see below), whose sum is σ = 62738781432. Its totient is φ = 59436740232.

The previous prime is 61087760813. The next prime is 61087760837. The reversal of 61087760831 is 13806778016.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61087760831 is a prime.

It is a super-2 number, since 2×61087760831² (a number of 22 digits) 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 (61087760837) 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, 825510245 + ... + 825510318.

It is an arithmetic number, because the mean of its divisors is an integer number (15684695358).

Almost surely, 2^61087760831 is an apocalyptic number.

61087760831 is a deficient number, since it is larger than the sum of its proper divisors (1651020601).

61087760831 is a wasteful number, since it uses less digits than its factorization.

61087760831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651020600.

The product of its (nonzero) digits is 338688, while the sum is 47.

The spelling of 61087760831 in words is "sixty-one billion, eighty-seven million, seven hundred sixty thousand, eight hundred thirty-one".