1256361258 has 32 divisors (see below), whose sum is σ = 2623700160. Its totient is φ = 400561280.

The previous prime is 1256361221. The next prime is 1256361313. The reversal of 1256361258 is 8521636521.

It is a super-2 number, since 2×1256361258² = 3156887221206685128, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15123 + ... + 52358.

It is an arithmetic number, because the mean of its divisors is an integer number (81990630).

Almost surely, 2^1256361258 is an apocalyptic number.

1256361258 is an abundant number, since it is smaller than the sum of its proper divisors (1367338902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1256361258 is a wasteful number, since it uses less digits than its factorization.

1256361258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67622.

The product of its digits is 86400, while the sum is 39.

The square root of 1256361258 is about 35445.1866689964. The cubic root of 1256361258 is about 1079.0415759866.

Adding to 1256361258 its reverse (8521636521), we get a palindrome (9777997779).

The spelling of 1256361258 in words is "one billion, two hundred fifty-six million, three hundred sixty-one thousand, two hundred fifty-eight".