1231145450523 has 64 divisors (see below), whose sum is σ = 1941050119680. Its totient is φ = 768555454464.

The previous prime is 1231145450519. The next prime is 1231145450551. The reversal of 1231145450523 is 3250545411321.

1231145450523 is a `hidden beast` number, since 1 + 2 + 3 + 1 + 145 + 4 + 505 + 2 + 3 = 666.

It is not a de Polignac number, because 1231145450523 - 2² = 1231145450519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231145450573) 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, 87413640 + ... + 87427722.

It is an arithmetic number, because the mean of its divisors is an integer number (30328908120).

Almost surely, 2^{1231145450523} is an apocalyptic number.

1231145450523 is a deficient number, since it is larger than the sum of its proper divisors (709904669157).

1231145450523 is a wasteful number, since it uses less digits than its factorization.

1231145450523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15065 (or 15059 counting only the distinct ones).

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

The spelling of 1231145450523 in words is "one trillion, two hundred thirty-one billion, one hundred forty-five million, four hundred fifty thousand, five hundred twenty-three".