172056551 has 2 divisors, whose sum is σ = 172056552. Its totient is φ = 172056550.

The previous prime is 172056529. The next prime is 172056553. The reversal of 172056551 is 155650271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172056551 - 2¹⁸ = 171794407 is a prime.

Together with 172056553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172056553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86028275 + 86028276.

It is an arithmetic number, because the mean of its divisors is an integer number (86028276).

Almost surely, 2^172056551 is an apocalyptic number.

172056551 is a deficient number, since it is larger than the sum of its proper divisors (1).

172056551 is an equidigital number, since it uses as much as digits as its factorization.

172056551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10500, while the sum is 32.

The square root of 172056551 is about 13117.0328580819. The cubic root of 172056551 is about 556.1907189950.

The spelling of 172056551 in words is "one hundred seventy-two million, fifty-six thousand, five hundred fifty-one".