45442721531 has 12 divisors (see below), whose sum is σ = 46755679320. Its totient is φ = 44165710080.

The previous prime is 45442721509. The next prime is 45442721579. The reversal of 45442721531 is 13512724454.

It is a de Polignac number, because none of the positive numbers 2^k-45442721531 is a prime.

It is a super-2 number, since 2×45442721531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45442721581) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1253936 + ... + 1289666.

It is an arithmetic number, because the mean of its divisors is an integer number (3896306610).

Almost surely, 2^45442721531 is an apocalyptic number.

45442721531 is a deficient number, since it is larger than the sum of its proper divisors (1312957789).

45442721531 is an equidigital number, since it uses as much as digits as its factorization.

45442721531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36734 (or 36697 counting only the distinct ones).

The product of its digits is 134400, while the sum is 38.

The spelling of 45442721531 in words is "forty-five billion, four hundred forty-two million, seven hundred twenty-one thousand, five hundred thirty-one".