172076621 has 4 divisors (see below), whose sum is σ = 172114272. Its totient is φ = 172038972.

The previous prime is 172076617. The next prime is 172076623. The reversal of 172076621 is 126670271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 172076621 - 2² = 172076617 is a prime.

It is a super-2 number, since 2×172076621² = 59220726989555282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172076623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10841 + ... + 21486.

It is an arithmetic number, because the mean of its divisors is an integer number (43028568).

Almost surely, 2^172076621 is an apocalyptic number.

It is an amenable number.

172076621 is a deficient number, since it is larger than the sum of its proper divisors (37651).

172076621 is an equidigital number, since it uses as much as digits as its factorization.

172076621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37650.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 172076621 is about 13117.7978715941. The cubic root of 172076621 is about 556.2123442758.

The spelling of 172076621 in words is "one hundred seventy-two million, seventy-six thousand, six hundred twenty-one".