1258831361 has 4 divisors (see below), whose sum is σ = 1260051012. Its totient is φ = 1257611712.

The previous prime is 1258831337. The next prime is 1258831363. The reversal of 1258831361 is 1631388521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1631388521 = 7 ⋅233055503.

It can be written as a sum of positive squares in 2 ways, for example, as 1214940736 + 43890625 = 34856^2 + 6625^2 .

It is a cyclic number.

It is not a de Polignac number, because 1258831361 - 2³⁰ = 185089537 is a prime.

It is a super-2 number, since 2×1258831361² = 3169312790874224642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1258831363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 608276 + ... + 610341.

It is an arithmetic number, because the mean of its divisors is an integer number (315012753).

Almost surely, 2^1258831361 is an apocalyptic number.

It is an amenable number.

1258831361 is a deficient number, since it is larger than the sum of its proper divisors (1219651).

1258831361 is a wasteful number, since it uses less digits than its factorization.

1258831361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219650.

The product of its digits is 34560, while the sum is 38.

The square root of 1258831361 is about 35480.0135428385. The cubic root of 1258831361 is about 1079.7482726646.

The spelling of 1258831361 in words is "one billion, two hundred fifty-eight million, eight hundred thirty-one thousand, three hundred sixty-one".