1253215881 has 56 divisors (see below), whose sum is σ = 2009581056. Its totient is φ = 779232960.

The previous prime is 1253215867. The next prime is 1253215891. The reversal of 1253215881 is 1885123521.

1253215881 is a `hidden beast` number, since 1 + 2 + 53 + 21 + 588 + 1 = 666.

It is not a de Polignac number, because 1253215881 - 2¹¹ = 1253213833 is a prime.

It is a super-2 number, since 2×1253215881² = 3141100088781212322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1253215801) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 686536 + ... + 688358.

It is an arithmetic number, because the mean of its divisors is an integer number (35885376).

Almost surely, 2^1253215881 is an apocalyptic number.

It is an amenable number.

1253215881 is a deficient number, since it is larger than the sum of its proper divisors (756365175).

1253215881 is an equidigital number, since it uses as much as digits as its factorization.

1253215881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1905 (or 1890 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 1253215881 is about 35400.7892708623. The cubic root of 1253215881 is about 1078.1403413469.

The spelling of 1253215881 in words is "one billion, two hundred fifty-three million, two hundred fifteen thousand, eight hundred eighty-one".