1231237252845 has 32 divisors (see below), whose sum is σ = 2190404774400. Its totient is φ = 656198304192.

The previous prime is 1231237252823. The next prime is 1231237252867. The reversal of 1231237252845 is 5482527321321.

1231237252845 is a `hidden beast` number, since 1 + 2 + 3 + 12 + 3 + 72 + 528 + 45 = 666.

It is an interprime number because it is at equal distance from previous prime (1231237252823) and next prime (1231237252867).

It is not a de Polignac number, because 1231237252845 - 2⁶ = 1231237252781 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1231237252845.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3012490 + ... + 3396699.

It is an arithmetic number, because the mean of its divisors is an integer number (68450149200).

Almost surely, 2^{1231237252845} is an apocalyptic number.

1231237252845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1231237252845 is a deficient number, since it is larger than the sum of its proper divisors (959167521555).

1231237252845 is a wasteful number, since it uses less digits than its factorization.

1231237252845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6410626 (or 6410620 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The spelling of 1231237252845 in words is "one trillion, two hundred thirty-one billion, two hundred thirty-seven million, two hundred fifty-two thousand, eight hundred forty-five".