172981933 has 2 divisors, whose sum is σ = 172981934. Its totient is φ = 172981932.

The previous prime is 172981931. The next prime is 172981961. The reversal of 172981933 is 339189271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110208004 + 62773929 = 10498^2 + 7923^2 .

It is a cyclic number.

It is not a de Polignac number, because 172981933 - 2¹ = 172981931 is a prime.

Together with 172981931, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 172981933.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172981931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86490966 + 86490967.

It is an arithmetic number, because the mean of its divisors is an integer number (86490967).

Almost surely, 2^172981933 is an apocalyptic number.

It is an amenable number.

172981933 is a deficient number, since it is larger than the sum of its proper divisors (1).

172981933 is an equidigital number, since it uses as much as digits as its factorization.

172981933 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 43.

The square root of 172981933 is about 13152.2596157466. The cubic root of 172981933 is about 557.1860679018.

The spelling of 172981933 in words is "one hundred seventy-two million, nine hundred eighty-one thousand, nine hundred thirty-three".