45131511221 has 4 divisors (see below), whose sum is σ = 45155532000. Its totient is φ = 45107490444.

The previous prime is 45131511181. The next prime is 45131511239. The reversal of 45131511221 is 12211513154.

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 45131511221 - 2¹⁸ = 45131249077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45131511251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12007571 + ... + 12011328.

It is an arithmetic number, because the mean of its divisors is an integer number (11288883000).

Almost surely, 2^45131511221 is an apocalyptic number.

It is an amenable number.

45131511221 is a deficient number, since it is larger than the sum of its proper divisors (24020779).

45131511221 is a wasteful number, since it uses less digits than its factorization.

45131511221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24020778.

The product of its digits is 1200, while the sum is 26.

The spelling of 45131511221 in words is "forty-five billion, one hundred thirty-one million, five hundred eleven thousand, two hundred twenty-one".