158641831 has 2 divisors, whose sum is σ = 158641832. Its totient is φ = 158641830.

The previous prime is 158641823. The next prime is 158641867. The reversal of 158641831 is 138146851.

It is a weak prime.

It is an emirp because it is prime and its reverse (138146851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 158641831 - 2³ = 158641823 is a prime.

It is a super-2 number, since 2×158641831² = 50334461086065122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158641871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79320915 + 79320916.

It is an arithmetic number, because the mean of its divisors is an integer number (79320916).

Almost surely, 2^158641831 is an apocalyptic number.

158641831 is a deficient number, since it is larger than the sum of its proper divisors (1).

158641831 is an equidigital number, since it uses as much as digits as its factorization.

158641831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 37.

The square root of 158641831 is about 12595.3098810629. The cubic root of 158641831 is about 541.3430571756.

The spelling of 158641831 in words is "one hundred fifty-eight million, six hundred forty-one thousand, eight hundred thirty-one".