1231335431555 has 8 divisors (see below), whose sum is σ = 1478148379152. Its totient is φ = 984704437728.

The previous prime is 1231335431503. The next prime is 1231335431671. The reversal of 1231335431555 is 5551345331321.

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 1231335431555 - 2⁸ = 1231335431299 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45473552 + ... + 45500621.

It is an arithmetic number, because the mean of its divisors is an integer number (184768547394).

Almost surely, 2^{1231335431555} is an apocalyptic number.

1231335431555 is a deficient number, since it is larger than the sum of its proper divisors (246812947597).

1231335431555 is an equidigital number, since it uses as much as digits as its factorization.

1231335431555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90976885.

The product of its digits is 405000, while the sum is 41.

The spelling of 1231335431555 in words is "one trillion, two hundred thirty-one billion, three hundred thirty-five million, four hundred thirty-one thousand, five hundred fifty-five".