1231513535 has 16 divisors (see below), whose sum is σ = 1690453056. Its totient is φ = 843706368.

The previous prime is 1231513523. The next prime is 1231513553. The reversal of 1231513535 is 5353151321.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1231513535 - 2⁸ = 1231513279 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231513498 and 1231513507.

It is a congruent 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, 25097 + ... + 55613.

It is an arithmetic number, because the mean of its divisors is an integer number (105653316).

Almost surely, 2^1231513535 is an apocalyptic number.

1231513535 is a deficient number, since it is larger than the sum of its proper divisors (458939521).

1231513535 is a wasteful number, since it uses less digits than its factorization.

1231513535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31682.

The product of its digits is 6750, while the sum is 29.

The square root of 1231513535 is about 35092.9271363903. The cubic root of 1231513535 is about 1071.8805648548.

Adding to 1231513535 its reverse (5353151321), we get a palindrome (6584664856).

The spelling of 1231513535 in words is "one billion, two hundred thirty-one million, five hundred thirteen thousand, five hundred thirty-five".