61358574731 has 2 divisors, whose sum is σ = 61358574732. Its totient is φ = 61358574730.

The previous prime is 61358574703. The next prime is 61358574743. The reversal of 61358574731 is 13747585316.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61358574731 is a prime.

It is a super-2 number, since 2×61358574731² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61358574731.

It is not a weakly prime, because it can be changed into another prime (61358574031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30679287365 + 30679287366.

It is an arithmetic number, because the mean of its divisors is an integer number (30679287366).

Almost surely, 2^61358574731 is an apocalyptic number.

61358574731 is a deficient number, since it is larger than the sum of its proper divisors (1).

61358574731 is an equidigital number, since it uses as much as digits as its factorization.

61358574731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2116800, while the sum is 50.

The spelling of 61358574731 in words is "sixty-one billion, three hundred fifty-eight million, five hundred seventy-four thousand, seven hundred thirty-one".