1231051513 has 8 divisors (see below), whose sum is σ = 1245017088. Its totient is φ = 1217152944.

The previous prime is 1231051483. The next prime is 1231051543. The reversal of 1231051513 is 3151501321.

It is an interprime number because it is at equal distance from previous prime (1231051483) and next prime (1231051543).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231051513 - 2⁹ = 1231051001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231051543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20670 + ... + 53752.

It is an arithmetic number, because the mean of its divisors is an integer number (155627136).

Almost surely, 2^1231051513 is an apocalyptic number.

It is an amenable number.

1231051513 is a deficient number, since it is larger than the sum of its proper divisors (13965575).

1231051513 is a wasteful number, since it uses less digits than its factorization.

1231051513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33503.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 1231051513 is about 35086.3436824073. The cubic root of 1231051513 is about 1071.7465037090.

Adding to 1231051513 its reverse (3151501321), we get a palindrome (4382552834).

The spelling of 1231051513 in words is "one billion, two hundred thirty-one million, fifty-one thousand, five hundred thirteen".