158551493 has 4 divisors (see below), whose sum is σ = 158592300. Its totient is φ = 158510688.

The previous prime is 158551487. The next prime is 158551511. The reversal of 158551493 is 394155851.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49098049 + 109453444 = 7007^2 + 10462^2 .

It is a cyclic number.

It is not a de Polignac number, because 158551493 - 2¹² = 158547397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 158551493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158551403) 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, 13880 + ... + 22577.

It is an arithmetic number, because the mean of its divisors is an integer number (39648075).

Almost surely, 2^158551493 is an apocalyptic number.

It is an amenable number.

158551493 is a deficient number, since it is larger than the sum of its proper divisors (40807).

158551493 is an equidigital number, since it uses as much as digits as its factorization.

158551493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40806.

The product of its digits is 108000, while the sum is 41.

The square root of 158551493 is about 12591.7231942256. The cubic root of 158551493 is about 541.2402824021.

The spelling of 158551493 in words is "one hundred fifty-eight million, five hundred fifty-one thousand, four hundred ninety-three".