1153215531 has 48 divisors (see below), whose sum is σ = 1869387520. Its totient is φ = 680244480.

The previous prime is 1153215527. The next prime is 1153215563. The reversal of 1153215531 is 1355123511.

1153215531 is a `hidden beast` number, since 115 + 3 + 2 + 15 + 531 = 666.

It is not a de Polignac number, because 1153215531 - 2² = 1153215527 is a prime.

It is a super-2 number, since 2×1153215531² = 2659812121879223922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1153215495 and 1153215504.

It is not an unprimeable number, because it can be changed into a prime (1153215521) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 393885 + ... + 396801.

Almost surely, 2^1153215531 is an apocalyptic number.

1153215531 is a deficient number, since it is larger than the sum of its proper divisors (716171989).

1153215531 is a wasteful number, since it uses less digits than its factorization.

1153215531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3076 (or 3073 counting only the distinct ones).

The product of its digits is 2250, while the sum is 27.

The square root of 1153215531 is about 33959.0272387181. The cubic root of 1153215531 is about 1048.6651309057.

The spelling of 1153215531 in words is "one billion, one hundred fifty-three million, two hundred fifteen thousand, five hundred thirty-one".