61512987839 has 2 divisors, whose sum is σ = 61512987840. Its totient is φ = 61512987838.

The previous prime is 61512987827. The next prime is 61512987853. The reversal of 61512987839 is 93878921516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61512987839 - 2²⁰ = 61511939263 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61512987869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30756493919 + 30756493920.

It is an arithmetic number, because the mean of its divisors is an integer number (30756493920).

Almost surely, 2^61512987839 is an apocalyptic number.

61512987839 is a deficient number, since it is larger than the sum of its proper divisors (1).

61512987839 is an equidigital number, since it uses as much as digits as its factorization.

61512987839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6531840, while the sum is 59.

The spelling of 61512987839 in words is "sixty-one billion, five hundred twelve million, nine hundred eighty-seven thousand, eight hundred thirty-nine".