258081557 has 2 divisors, whose sum is σ = 258081558. Its totient is φ = 258081556.

The previous prime is 258081529. The next prime is 258081569. The reversal of 258081557 is 755180852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152423716 + 105657841 = 12346^2 + 10279^2 .

It is a cyclic number.

It is not a de Polignac number, because 258081557 - 2⁶ = 258081493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (258084557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129040778 + 129040779.

It is an arithmetic number, because the mean of its divisors is an integer number (129040779).

Almost surely, 2^258081557 is an apocalyptic number.

It is an amenable number.

258081557 is a deficient number, since it is larger than the sum of its proper divisors (1).

258081557 is an equidigital number, since it uses as much as digits as its factorization.

258081557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112000, while the sum is 41.

The square root of 258081557 is about 16064.9169621259. The cubic root of 258081557 is about 636.6767490462.

The spelling of 258081557 in words is "two hundred fifty-eight million, eighty-one thousand, five hundred fifty-seven".