1253974793521 has 4 divisors (see below), whose sum is σ = 1294425593344. Its totient is φ = 1213523993700.

The previous prime is 1253974793507. The next prime is 1253974793549.

1253974793521 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1253974793521 - 2²³ = 1253966404913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1253974793921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20225399865 + ... + 20225399926.

It is an arithmetic number, because the mean of its divisors is an integer number (323606398336).

Almost surely, 2^{1253974793521} is an apocalyptic number.

It is an amenable number.

1253974793521 is a deficient number, since it is larger than the sum of its proper divisors (40450799823).

1253974793521 is an equidigital number, since it uses as much as digits as its factorization.

1253974793521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40450799822.

The product of its digits is 14288400, while the sum is 58.

The spelling of 1253974793521 in words is "one trillion, two hundred fifty-three billion, nine hundred seventy-four million, seven hundred ninety-three thousand, five hundred twenty-one".