158623961 has 2 divisors, whose sum is σ = 158623962. Its totient is φ = 158623960.

The previous prime is 158623909. The next prime is 158623981. The reversal of 158623961 is 169326851.

158623961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111619225 + 47004736 = 10565^2 + 6856^2 .

It is a cyclic number.

It is not a de Polignac number, because 158623961 - 2⁶ = 158623897 is a prime.

It is a super-2 number, since 2×158623961² = 50323122006659042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (158623901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79311980 + 79311981.

It is an arithmetic number, because the mean of its divisors is an integer number (79311981).

Almost surely, 2^158623961 is an apocalyptic number.

It is an amenable number.

158623961 is a deficient number, since it is larger than the sum of its proper divisors (1).

158623961 is an equidigital number, since it uses as much as digits as its factorization.

158623961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 41.

The square root of 158623961 is about 12594.6004700427. The cubic root of 158623961 is about 541.3227301206.

The spelling of 158623961 in words is "one hundred fifty-eight million, six hundred twenty-three thousand, nine hundred sixty-one".