258761961 has 6 divisors (see below), whose sum is σ = 373767290. Its totient is φ = 172507968.

The previous prime is 258761957. The next prime is 258761963. The reversal of 258761961 is 169167852.

258761961 is a `hidden beast` number, since 2 + 587 + 6 + 1 + 9 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 237776400 + 20985561 = 15420^2 + 4581^2 .

It is not a de Polignac number, because 258761961 - 2² = 258761957 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (258761963) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14375656 + ... + 14375673.

Almost surely, 2^258761961 is an apocalyptic number.

It is an amenable number.

258761961 is a deficient number, since it is larger than the sum of its proper divisors (115005329).

258761961 is a wasteful number, since it uses less digits than its factorization.

258761961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28751335 (or 28751332 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 258761961 is about 16086.0797275160. The cubic root of 258761961 is about 637.2357677736.

The spelling of 258761961 in words is "two hundred fifty-eight million, seven hundred sixty-one thousand, nine hundred sixty-one".