158109831 has 12 divisors (see below), whose sum is σ = 249142920. Its totient is φ = 95824080.

The previous prime is 158109821. The next prime is 158109857. The reversal of 158109831 is 138901851.

It is not a de Polignac number, because 158109831 - 2⁵ = 158109799 is a prime.

It is a super-2 number, since 2×158109831² = 49997437317697122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158109821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 798436 + ... + 798633.

It is an arithmetic number, because the mean of its divisors is an integer number (20761910).

Almost surely, 2^158109831 is an apocalyptic number.

158109831 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

158109831 is a deficient number, since it is larger than the sum of its proper divisors (91033089).

158109831 is a wasteful number, since it uses less digits than its factorization.

158109831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1597086 (or 1597083 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 36.

The square root of 158109831 is about 12574.1731736126. The cubic root of 158109831 is about 540.7372542960.

The spelling of 158109831 in words is "one hundred fifty-eight million, one hundred nine thousand, eight hundred thirty-one".