172303131 has 64 divisors (see below), whose sum is σ = 311141376. Its totient is φ = 81907200.

The previous prime is 172303129. The next prime is 172303147. The reversal of 172303131 is 131303271.

It is not a de Polignac number, because 172303131 - 2¹ = 172303129 is a prime.

It is a super-2 number, since 2×172303131² = 59376737904806322, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 172303098 and 172303107.

It is not an unprimeable number, because it can be changed into a prime (172313131) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 543385 + ... + 543701.

It is an arithmetic number, because the mean of its divisors is an integer number (4861584).

Almost surely, 2^172303131 is an apocalyptic number.

172303131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

172303131 is a deficient number, since it is larger than the sum of its proper divisors (138838245).

172303131 is a wasteful number, since it uses less digits than its factorization.

172303131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532.

The product of its (nonzero) digits is 378, while the sum is 21.

The square root of 172303131 is about 13126.4287222382. The cubic root of 172303131 is about 556.4562906783.

It can be divided in two parts, 172 and 303131, that added together give a palindrome (303303).

The spelling of 172303131 in words is "one hundred seventy-two million, three hundred three thousand, one hundred thirty-one".