245331431521 has 4 divisors (see below), whose sum is σ = 267634288944. Its totient is φ = 223028574100.

The previous prime is 245331431503. The next prime is 245331431537. The reversal of 245331431521 is 125134133542.

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 245331431521 - 2¹⁹ = 245330907233 is a prime.

It is a super-2 number, since 2×245331431521² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (245331431551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11151428695 + ... + 11151428716.

It is an arithmetic number, because the mean of its divisors is an integer number (66908572236).

Almost surely, 2^245331431521 is an apocalyptic number.

It is an amenable number.

245331431521 is a deficient number, since it is larger than the sum of its proper divisors (22302857423).

245331431521 is a wasteful number, since it uses less digits than its factorization.

245331431521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22302857422.

The product of its digits is 43200, while the sum is 34.

The spelling of 245331431521 in words is "two hundred forty-five billion, three hundred thirty-one million, four hundred thirty-one thousand, five hundred twenty-one".