158917531 has 4 divisors (see below), whose sum is σ = 160375600. Its totient is φ = 157459464.

The previous prime is 158917529. The next prime is 158917537. The reversal of 158917531 is 135719851.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 158917531 - 2¹ = 158917529 is a prime.

It is a super-2 number, since 2×158917531² = 50509563318271922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158917537) 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, 728871 + ... + 729088.

It is an arithmetic number, because the mean of its divisors is an integer number (40093900).

Almost surely, 2^158917531 is an apocalyptic number.

158917531 is a deficient number, since it is larger than the sum of its proper divisors (1458069).

158917531 is a wasteful number, since it uses less digits than its factorization.

158917531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458068.

The product of its digits is 37800, while the sum is 40.

The square root of 158917531 is about 12606.2496802181. The cubic root of 158917531 is about 541.6564715819.

The spelling of 158917531 in words is "one hundred fifty-eight million, nine hundred seventeen thousand, five hundred thirty-one".