158721093 has 8 divisors (see below), whose sum is σ = 235142400. Its totient is φ = 105814044.

The previous prime is 158721067. The next prime is 158721097. The reversal of 158721093 is 390127851.

158721093 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 158721093 - 2¹⁶ = 158655557 is a prime.

It is a super-2 number, since 2×158721093² = 50384770726229298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158721097) 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, 2939253 + ... + 2939306.

It is an arithmetic number, because the mean of its divisors is an integer number (29392800).

Almost surely, 2^158721093 is an apocalyptic number.

It is an amenable number.

158721093 is a deficient number, since it is larger than the sum of its proper divisors (76421307).

158721093 is an equidigital number, since it uses as much as digits as its factorization.

158721093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5878568 (or 5878562 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 158721093 is about 12598.4559768251. The cubic root of 158721093 is about 541.4331989940.

The spelling of 158721093 in words is "one hundred fifty-eight million, seven hundred twenty-one thousand, ninety-three".