158161731 has 32 divisors (see below), whose sum is σ = 270842880. Its totient is φ = 79795584.

The previous prime is 158161709. The next prime is 158161733. The reversal of 158161731 is 137161851.

It is not a de Polignac number, because 158161731 - 2¹⁷ = 158030659 is a prime.

It is a super-2 number, since 2×158161731² = 50030266305832722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 158161692 and 158161701.

It is not an unprimeable number, because it can be changed into a prime (158161733) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6316 + ... + 18873.

It is an arithmetic number, because the mean of its divisors is an integer number (8463840).

Almost surely, 2^158161731 is an apocalyptic number.

158161731 is a deficient number, since it is larger than the sum of its proper divisors (112681149).

158161731 is a wasteful number, since it uses less digits than its factorization.

158161731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25235.

The product of its digits is 5040, while the sum is 33.

The square root of 158161731 is about 12576.2367582676. The cubic root of 158161731 is about 540.7964140020.

The spelling of 158161731 in words is "one hundred fifty-eight million, one hundred sixty-one thousand, seven hundred thirty-one".