1231504011 has 12 divisors (see below), whose sum is σ = 1816687392. Its totient is φ = 803534256.

The previous prime is 1231504007. The next prime is 1231504013. The reversal of 1231504011 is 1104051321.

It is not a de Polignac number, because 1231504011 - 2² = 1231504007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231504013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1455256 + ... + 1456101.

It is an arithmetic number, because the mean of its divisors is an integer number (151390616).

Almost surely, 2^1231504011 is an apocalyptic number.

1231504011 is a deficient number, since it is larger than the sum of its proper divisors (585183381).

1231504011 is a wasteful number, since it uses less digits than its factorization.

1231504011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2911410 (or 2911407 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1231504011 is about 35092.7914392685. The cubic root of 1231504011 is about 1071.8778016921.

Adding to 1231504011 its reverse (1104051321), we get a palindrome (2335555332).

The spelling of 1231504011 in words is "one billion, two hundred thirty-one million, five hundred four thousand, eleven".