172125731 has 16 divisors (see below), whose sum is σ = 193052160. Its totient is φ = 152507520.

The previous prime is 172125719. The next prime is 172125743. The reversal of 172125731 is 137521271.

It is an interprime number because it is at equal distance from previous prime (172125719) and next prime (172125743).

It is a cyclic number.

It is not a de Polignac number, because 172125731 - 2¹⁰ = 172124707 is a prime.

It is a super-2 number, since 2×172125731² = 59254534544568722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 172125694 and 172125703.

It is not an unprimeable number, because it can be changed into a prime (172125761) 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, 52346 + ... + 55536.

It is an arithmetic number, because the mean of its divisors is an integer number (12065760).

Almost surely, 2^172125731 is an apocalyptic number.

172125731 is a deficient number, since it is larger than the sum of its proper divisors (20926429).

172125731 is a wasteful number, since it uses less digits than its factorization.

172125731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3394.

The product of its digits is 2940, while the sum is 29.

The square root of 172125731 is about 13119.6696223647. The cubic root of 172125731 is about 556.2652528579.

The spelling of 172125731 in words is "one hundred seventy-two million, one hundred twenty-five thousand, seven hundred thirty-one".