172991253 has 16 divisors (see below), whose sum is σ = 241657856. Its totient is φ = 109937520.

The previous prime is 172991251. The next prime is 172991263. The reversal of 172991253 is 352199271.

172991253 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 172991253 - 2¹ = 172991251 is a prime.

It is a super-2 number, since 2×172991253² = 59851947229020018, 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 (172991251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7651 + ... + 20112.

It is an arithmetic number, because the mean of its divisors is an integer number (15103616).

Almost surely, 2^172991253 is an apocalyptic number.

It is an amenable number.

172991253 is a deficient number, since it is larger than the sum of its proper divisors (68666603).

172991253 is a wasteful number, since it uses less digits than its factorization.

172991253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27864.

The product of its digits is 34020, while the sum is 39.

The square root of 172991253 is about 13152.6139227151. The cubic root of 172991253 is about 557.1960744977.

The spelling of 172991253 in words is "one hundred seventy-two million, nine hundred ninety-one thousand, two hundred fifty-three".