61700172931 has 2 divisors, whose sum is σ = 61700172932. Its totient is φ = 61700172930.

The previous prime is 61700172907. The next prime is 61700172953. The reversal of 61700172931 is 13927100716.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61700172931 - 2¹⁵ = 61700140163 is a prime.

It is a super-2 number, since 2×61700172931² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61700112931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30850086465 + 30850086466.

It is an arithmetic number, because the mean of its divisors is an integer number (30850086466).

Almost surely, 2^61700172931 is an apocalyptic number.

61700172931 is a deficient number, since it is larger than the sum of its proper divisors (1).

61700172931 is an equidigital number, since it uses as much as digits as its factorization.

61700172931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 37.

The spelling of 61700172931 in words is "sixty-one billion, seven hundred million, one hundred seventy-two thousand, nine hundred thirty-one".