1231513405 has 16 divisors (see below), whose sum is σ = 1647103680. Its totient is φ = 878452992.

The previous prime is 1231513373. The next prime is 1231513429. The reversal of 1231513405 is 5043151321.

It is a happy number.

It is not a de Polignac number, because 1231513405 - 2⁵ = 1231513373 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1231513405.

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, 379659 + ... + 382888.

It is an arithmetic number, because the mean of its divisors is an integer number (102943980).

Almost surely, 2^1231513405 is an apocalyptic number.

It is an amenable number.

1231513405 is a deficient number, since it is larger than the sum of its proper divisors (415590275).

1231513405 is a wasteful number, since it uses less digits than its factorization.

1231513405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762588.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1231513405 is about 35092.9252841652. The cubic root of 1231513405 is about 1071.8805271385.

Adding to 1231513405 its reverse (5043151321), we get a palindrome (6274664726).

The spelling of 1231513405 in words is "one billion, two hundred thirty-one million, five hundred thirteen thousand, four hundred five".