158513791 has 4 divisors (see below), whose sum is σ = 158757192. Its totient is φ = 158270392.

The previous prime is 158513783. The next prime is 158513813. The reversal of 158513791 is 197315851.

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 158513791 - 2³ = 158513783 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158513701) 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, 120721 + ... + 122026.

It is an arithmetic number, because the mean of its divisors is an integer number (39689298).

Almost surely, 2^158513791 is an apocalyptic number.

158513791 is a deficient number, since it is larger than the sum of its proper divisors (243401).

158513791 is an equidigital number, since it uses as much as digits as its factorization.

158513791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243400.

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

The square root of 158513791 is about 12590.2260106799. The cubic root of 158513791 is about 541.1973784462.

It can be divided in two parts, 1585 and 13791, that added together give a square (15376 = 124²).

The spelling of 158513791 in words is "one hundred fifty-eight million, five hundred thirteen thousand, seven hundred ninety-one".