1231351042520 has 16 divisors (see below), whose sum is σ = 2770539845760. Its totient is φ = 492540416992.

The previous prime is 1231351042517. The next prime is 1231351042541. The reversal of 1231351042520 is 252401531321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15391887992 + ... + 15391888071.

It is an arithmetic number, because the mean of its divisors is an integer number (173158740360).

Almost surely, 2^{1231351042520} is an apocalyptic number.

1231351042520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231351042520 is an abundant number, since it is smaller than the sum of its proper divisors (1539188803240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231351042520 is a wasteful number, since it uses less digits than its factorization.

1231351042520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30783776074 (or 30783776070 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 1231351042520 its reverse (252401531321), we get a palindrome (1483752573841).

The spelling of 1231351042520 in words is "one trillion, two hundred thirty-one billion, three hundred fifty-one million, forty-two thousand, five hundred twenty".