172431491 has 2 divisors, whose sum is σ = 172431492. Its totient is φ = 172431490.

The previous prime is 172431461. The next prime is 172431547. The reversal of 172431491 is 194134271.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172431491 is a prime.

It is not a weakly prime, because it can be changed into another prime (172431461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86215745 + 86215746.

It is an arithmetic number, because the mean of its divisors is an integer number (86215746).

Almost surely, 2^172431491 is an apocalyptic number.

172431491 is a deficient number, since it is larger than the sum of its proper divisors (1).

172431491 is an equidigital number, since it uses as much as digits as its factorization.

172431491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 32.

The square root of 172431491 is about 13131.3171845021. The cubic root of 172431491 is about 556.5944367460.

The spelling of 172431491 in words is "one hundred seventy-two million, four hundred thirty-one thousand, four hundred ninety-one".