172313537 has 4 divisors (see below), whose sum is σ = 187978416. Its totient is φ = 156648660.

The previous prime is 172313501. The next prime is 172313567. The reversal of 172313537 is 735313271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 172313537 - 2¹⁶ = 172248001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172313567) 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, 7832423 + ... + 7832444.

It is an arithmetic number, because the mean of its divisors is an integer number (46994604).

Almost surely, 2^172313537 is an apocalyptic number.

It is an amenable number.

172313537 is a deficient number, since it is larger than the sum of its proper divisors (15664879).

172313537 is a wasteful number, since it uses less digits than its factorization.

172313537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15664878.

The product of its digits is 13230, while the sum is 32.

The square root of 172313537 is about 13126.8250921539. The cubic root of 172313537 is about 556.4674925789.

The spelling of 172313537 in words is "one hundred seventy-two million, three hundred thirteen thousand, five hundred thirty-seven".