158977621 has 8 divisors (see below), whose sum is σ = 174312864. Its totient is φ = 143789520.

The previous prime is 158977607. The next prime is 158977631. The reversal of 158977621 is 126779851.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 158977621 - 2⁵ = 158977589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158977601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34515 + ... + 38848.

It is an arithmetic number, because the mean of its divisors is an integer number (21789108).

Almost surely, 2^158977621 is an apocalyptic number.

158977621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

158977621 is a deficient number, since it is larger than the sum of its proper divisors (15335243).

158977621 is a wasteful number, since it uses less digits than its factorization.

158977621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73571.

The product of its digits is 211680, while the sum is 46.

The square root of 158977621 is about 12608.6327966199. The cubic root of 158977621 is about 541.7247334778.

It can be divided in two parts, 158 and 977621, that added together give a palindrome (977779).

The spelling of 158977621 in words is "one hundred fifty-eight million, nine hundred seventy-seven thousand, six hundred twenty-one".