158180721 has 8 divisors (see below), whose sum is σ = 211474560. Its totient is φ = 105170352.

The previous prime is 158180717. The next prime is 158180741. The reversal of 158180721 is 127081851.

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

It is not a de Polignac number, because 158180721 - 2² = 158180717 is a prime.

It is a super-2 number, since 2×158180721² = 50042280992159682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (158180741) 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, 69561 + ... + 71798.

It is an arithmetic number, because the mean of its divisors is an integer number (26434320).

Almost surely, 2^158180721 is an apocalyptic number.

It is an amenable number.

158180721 is a deficient number, since it is larger than the sum of its proper divisors (53293839).

158180721 is a wasteful number, since it uses less digits than its factorization.

158180721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141735.

The product of its (nonzero) digits is 4480, while the sum is 33.

The square root of 158180721 is about 12576.9917309347. The cubic root of 158180721 is about 540.8180570649.

The spelling of 158180721 in words is "one hundred fifty-eight million, one hundred eighty thousand, seven hundred twenty-one".