1213540231131 has 24 divisors (see below), whose sum is σ = 1759080888864. Its totient is φ = 806171794560.

The previous prime is 1213540231117. The next prime is 1213540231147. The reversal of 1213540231131 is 1311320453121.

1213540231131 is a `hidden beast` number, since 1 + 2 + 1 + 3 + 540 + 2 + 3 + 113 + 1 = 666.

It is not a de Polignac number, because 1213540231131 - 2⁷ = 1213540231003 is a prime.

It is a super-2 number, since 2×1213540231131² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1213540231095 and 1213540231104.

It is not an unprimeable number, because it can be changed into a prime (1213540231151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9049785 + ... + 9182901.

It is an arithmetic number, because the mean of its divisors is an integer number (73295037036).

Almost surely, 2^{1213540231131} is an apocalyptic number.

1213540231131 is a deficient number, since it is larger than the sum of its proper divisors (545540657733).

1213540231131 is a wasteful number, since it uses less digits than its factorization.

1213540231131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136691 (or 136688 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

Adding to 1213540231131 its reverse (1311320453121), we get a palindrome (2524860684252).

The spelling of 1213540231131 in words is "one trillion, two hundred thirteen billion, five hundred forty million, two hundred thirty-one thousand, one hundred thirty-one".