61505362931 has 2 divisors, whose sum is σ = 61505362932. Its totient is φ = 61505362930.

The previous prime is 61505362901. The next prime is 61505362943. The reversal of 61505362931 is 13926350516.

61505362931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61505362931 - 2²² = 61501168627 is a prime.

It is a super-2 number, since 2×61505362931² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61505362901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30752681465 + 30752681466.

It is an arithmetic number, because the mean of its divisors is an integer number (30752681466).

Almost surely, 2^61505362931 is an apocalyptic number.

61505362931 is a deficient number, since it is larger than the sum of its proper divisors (1).

61505362931 is an equidigital number, since it uses as much as digits as its factorization.

61505362931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145800, while the sum is 41.

The spelling of 61505362931 in words is "sixty-one billion, five hundred five million, three hundred sixty-two thousand, nine hundred thirty-one".