1231770531315 has 64 divisors (see below), whose sum is σ = 2028523585536. Its totient is φ = 637947115392.

The previous prime is 1231770531289. The next prime is 1231770531319. The reversal of 1231770531315 is 5131350771321.

It is not a de Polignac number, because 1231770531315 - 2⁸ = 1231770531059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231770531319) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 66275514 + ... + 66294096.

It is an arithmetic number, because the mean of its divisors is an integer number (31695681024).

Almost surely, 2^{1231770531315} is an apocalyptic number.

1231770531315 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1231770531315 is a deficient number, since it is larger than the sum of its proper divisors (796753054221).

1231770531315 is a wasteful number, since it uses less digits than its factorization.

1231770531315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19368.

The product of its (nonzero) digits is 66150, while the sum is 39.

The spelling of 1231770531315 in words is "one trillion, two hundred thirty-one billion, seven hundred seventy million, five hundred thirty-one thousand, three hundred fifteen".