172901001 has 16 divisors (see below), whose sum is σ = 283735424. Its totient is φ = 91200384.

The previous prime is 172900997. The next prime is 172901009. The reversal of 172901001 is 100109271.

It is not a de Polignac number, because 172901001 - 2² = 172900997 is a prime.

It is a super-2 number, since 2×172901001² = 59789512293604002, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (172901009) 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 in 15 ways as a sum of consecutive naturals, for example, 316396 + ... + 316941.

It is an arithmetic number, because the mean of its divisors is an integer number (17733464).

Almost surely, 2^172901001 is an apocalyptic number.

It is an amenable number.

172901001 is a deficient number, since it is larger than the sum of its proper divisors (110834423).

172901001 is a wasteful number, since it uses less digits than its factorization.

172901001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633360.

The product of its (nonzero) digits is 126, while the sum is 21.

The square root of 172901001 is about 13149.1825221190. The cubic root of 172901001 is about 557.0991585995.

The spelling of 172901001 in words is "one hundred seventy-two million, nine hundred one thousand, one".