1231352451540 has 72 divisors (see below), whose sum is σ = 3735365273640. Its totient is φ = 328337547264.

The previous prime is 1231352451529. The next prime is 1231352451551. The reversal of 1231352451540 is 451542531321.

1231352451540 is a `hidden beast` number, since 1 + 2 + 3 + 13 + 52 + 4 + 51 + 540 = 666.

It is an interprime number because it is at equal distance from previous prime (1231352451529) and next prime (1231352451551).

It can be written as a sum of positive squares in 4 ways, for example, as 506562439824 + 724790011716 = 711732^2 + 851346^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1231352451495 and 1231352451504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2404896 + ... + 2871624.

It is an arithmetic number, because the mean of its divisors is an integer number (51880073245).

Almost surely, 2^{1231352451540} is an apocalyptic number.

1231352451540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231352451540 is an abundant number, since it is smaller than the sum of its proper divisors (2504012822100).

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

1231352451540 is a wasteful number, since it uses less digits than its factorization.

1231352451540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481401 (or 481396 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

Adding to 1231352451540 its reverse (451542531321), we get a palindrome (1682894982861).

The spelling of 1231352451540 in words is "one trillion, two hundred thirty-one billion, three hundred fifty-two million, four hundred fifty-one thousand, five hundred forty".