172890428939 has 2 divisors, whose sum is σ = 172890428940. Its totient is φ = 172890428938.

The previous prime is 172890428863. The next prime is 172890428981. The reversal of 172890428939 is 939824098271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172890428939 - 2¹² = 172890424843 is a prime.

It is a super-2 number, since 2×172890428939² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (172890428339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86445214469 + 86445214470.

It is an arithmetic number, because the mean of its divisors is an integer number (86445214470).

Almost surely, 2^172890428939 is an apocalyptic number.

172890428939 is a deficient number, since it is larger than the sum of its proper divisors (1).

172890428939 is an equidigital number, since it uses as much as digits as its factorization.

172890428939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15676416, while the sum is 62.

The spelling of 172890428939 in words is "one hundred seventy-two billion, eight hundred ninety million, four hundred twenty-eight thousand, nine hundred thirty-nine".