158561521 has 2 divisors, whose sum is σ = 158561522. Its totient is φ = 158561520.

The previous prime is 158561489. The next prime is 158561527. The reversal of 158561521 is 125165851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111830625 + 46730896 = 10575^2 + 6836^2 .

It is a cyclic number.

It is not a de Polignac number, because 158561521 - 2⁵ = 158561489 is a prime.

It is not a weakly prime, because it can be changed into another prime (158561527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79280760 + 79280761.

It is an arithmetic number, because the mean of its divisors is an integer number (79280761).

Almost surely, 2^158561521 is an apocalyptic number.

It is an amenable number.

158561521 is a deficient number, since it is larger than the sum of its proper divisors (1).

158561521 is an equidigital number, since it uses as much as digits as its factorization.

158561521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12000, while the sum is 34.

The square root of 158561521 is about 12592.1213860096. The cubic root of 158561521 is about 541.2516928762.

The spelling of 158561521 in words is "one hundred fifty-eight million, five hundred sixty-one thousand, five hundred twenty-one".