45315221 has 16 divisors (see below), whose sum is σ = 54432000. Its totient is φ = 36883968.

The previous prime is 45315181. The next prime is 45315223. The reversal of 45315221 is 12251354.

It is a cyclic number.

It is not a de Polignac number, because 45315221 - 2⁶ = 45315157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45315223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23045 + ... + 24933.

It is an arithmetic number, because the mean of its divisors is an integer number (3402000).

Almost surely, 2^45315221 is an apocalyptic number.

It is an amenable number.

45315221 is a deficient number, since it is larger than the sum of its proper divisors (9116779).

45315221 is a wasteful number, since it uses less digits than its factorization.

45315221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2068.

The product of its digits is 1200, while the sum is 23.

The square root of 45315221 is about 6731.6581166901. The cubic root of 45315221 is about 356.5179227594.

Adding to 45315221 its reverse (12251354), we get a palindrome (57566575).

The spelling of 45315221 in words is "forty-five million, three hundred fifteen thousand, two hundred twenty-one".