1258861401 has 18 divisors (see below), whose sum is σ = 2115230442. Its totient is φ = 719349120.

The previous prime is 1258861393. The next prime is 1258861403. The reversal of 1258861401 is 1041688521.

1258861401 is a `hidden beast` number, since 12 + 588 + 61 + 4 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1209370176 + 49491225 = 34776^2 + 7035^2 .

It is not a de Polignac number, because 1258861401 - 2³ = 1258861393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1258861403) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1426840 + ... + 1427721.

Almost surely, 2^1258861401 is an apocalyptic number.

It is an amenable number.

1258861401 is a deficient number, since it is larger than the sum of its proper divisors (856369041).

1258861401 is a wasteful number, since it uses less digits than its factorization.

1258861401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2854581 (or 2854571 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 1258861401 is about 35480.4368772426. The cubic root of 1258861401 is about 1079.7568614190.

The spelling of 1258861401 in words is "one billion, two hundred fifty-eight million, eight hundred sixty-one thousand, four hundred one".