172148731 has 4 divisors (see below), whose sum is σ = 173014000. Its totient is φ = 171283464.

The previous prime is 172148729. The next prime is 172148747. The reversal of 172148731 is 137841271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137841271 = 47 ⋅2932793.

It is a cyclic number.

It is not a de Polignac number, because 172148731 - 2¹ = 172148729 is a prime.

It is a super-2 number, since 2×172148731² = 59270371169820722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172148761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 432336 + ... + 432733.

It is an arithmetic number, because the mean of its divisors is an integer number (43253500).

Almost surely, 2^172148731 is an apocalyptic number.

172148731 is a deficient number, since it is larger than the sum of its proper divisors (865269).

172148731 is an equidigital number, since it uses as much as digits as its factorization.

172148731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865268.

The product of its digits is 9408, while the sum is 34.

The square root of 172148731 is about 13120.5461395477. The cubic root of 172148731 is about 556.2900284118.

The spelling of 172148731 in words is "one hundred seventy-two million, one hundred forty-eight thousand, seven hundred thirty-one".