158838631 has 4 divisors (see below), whose sum is σ = 181529872. Its totient is φ = 136147392.

The previous prime is 158838623. The next prime is 158838643. The reversal of 158838631 is 136838851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136838851 = 281 ⋅486971.

It is a cyclic number.

It is not a de Polignac number, because 158838631 - 2³ = 158838623 is a prime.

It is a super-2 number, since 2×158838631² = 50459421395908322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158838661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11345610 + ... + 11345623.

It is an arithmetic number, because the mean of its divisors is an integer number (45382468).

Almost surely, 2^158838631 is an apocalyptic number.

158838631 is a deficient number, since it is larger than the sum of its proper divisors (22691241).

158838631 is an equidigital number, since it uses as much as digits as its factorization.

158838631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22691240.

The product of its digits is 138240, while the sum is 43.

The square root of 158838631 is about 12603.1198915189. The cubic root of 158838631 is about 541.5668154985.

The spelling of 158838631 in words is "one hundred fifty-eight million, eight hundred thirty-eight thousand, six hundred thirty-one".