1231553515 has 16 divisors (see below), whose sum is σ = 1561651200. Its totient is φ = 930470112.

The previous prime is 1231553471. The next prime is 1231553567. The reversal of 1231553515 is 5153551321.

It is a cyclic number.

It is not a de Polignac number, because 1231553515 - 2⁹ = 1231553003 is a prime.

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, 58695 + ... + 76864.

It is an arithmetic number, because the mean of its divisors is an integer number (97603200).

Almost surely, 2^1231553515 is an apocalyptic number.

1231553515 is a deficient number, since it is larger than the sum of its proper divisors (330097685).

1231553515 is a wasteful number, since it uses less digits than its factorization.

1231553515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135666.

The product of its digits is 11250, while the sum is 31.

The square root of 1231553515 is about 35093.4967622208. The cubic root of 1231553515 is about 1071.8921639481.

The spelling of 1231553515 in words is "one billion, two hundred thirty-one million, five hundred fifty-three thousand, five hundred fifteen".