172298621 has 24 divisors (see below), whose sum is σ = 202384224. Its totient is φ = 145422080.

The previous prime is 172298573. The next prime is 172298629. The reversal of 172298621 is 126892271.

It is not a de Polignac number, because 172298621 - 2¹⁴ = 172282237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172298629) 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 23 ways as a sum of consecutive naturals, for example, 263531 + ... + 264183.

It is an arithmetic number, because the mean of its divisors is an integer number (8432676).

Almost surely, 2^172298621 is an apocalyptic number.

172298621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

172298621 is a deficient number, since it is larger than the sum of its proper divisors (30085603).

172298621 is a wasteful number, since it uses less digits than its factorization.

172298621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781 (or 764 counting only the distinct ones).

The product of its digits is 24192, while the sum is 38.

The square root of 172298621 is about 13126.2569302905. The cubic root of 172298621 is about 556.4514355919.

The spelling of 172298621 in words is "one hundred seventy-two million, two hundred ninety-eight thousand, six hundred twenty-one".