172492321 has 2 divisors, whose sum is σ = 172492322. Its totient is φ = 172492320.

The previous prime is 172492301. The next prime is 172492337. The reversal of 172492321 is 123294271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99201600 + 73290721 = 9960^2 + 8561^2 .

It is a cyclic number.

It is not a de Polignac number, because 172492321 - 2⁷ = 172492193 is a prime.

It is not a weakly prime, because it can be changed into another prime (172492301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86246160 + 86246161.

It is an arithmetic number, because the mean of its divisors is an integer number (86246161).

Almost surely, 2^172492321 is an apocalyptic number.

It is an amenable number.

172492321 is a deficient number, since it is larger than the sum of its proper divisors (1).

172492321 is an equidigital number, since it uses as much as digits as its factorization.

172492321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 31.

The square root of 172492321 is about 13133.6331987763. The cubic root of 172492321 is about 556.6598804357.

The spelling of 172492321 in words is "one hundred seventy-two million, four hundred ninety-two thousand, three hundred twenty-one".