173139881 has 2 divisors, whose sum is σ = 173139882. Its totient is φ = 173139880.

The previous prime is 173139877. The next prime is 173139907. The reversal of 173139881 is 188931371.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94090000 + 79049881 = 9700^2 + 8891^2 .

It is a cyclic number.

It is not a de Polignac number, because 173139881 - 2² = 173139877 is a prime.

It is a super-2 number, since 2×173139881² = 59954836785388322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (173139821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86569940 + 86569941.

It is an arithmetic number, because the mean of its divisors is an integer number (86569941).

Almost surely, 2^173139881 is an apocalyptic number.

It is an amenable number.

173139881 is a deficient number, since it is larger than the sum of its proper divisors (1).

173139881 is an equidigital number, since it uses as much as digits as its factorization.

173139881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 41.

The square root of 173139881 is about 13158.2628412720. The cubic root of 173139881 is about 557.3556032423.

The spelling of 173139881 in words is "one hundred seventy-three million, one hundred thirty-nine thousand, eight hundred eighty-one".