45516721 has 2 divisors, whose sum is σ = 45516722. Its totient is φ = 45516720.

The previous prime is 45516659. The next prime is 45516781. The reversal of 45516721 is 12761554.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39942400 + 5574321 = 6320^2 + 2361^2 .

It is a cyclic number.

It is not a de Polignac number, because 45516721 - 2⁷ = 45516593 is a prime.

It is not a weakly prime, because it can be changed into another prime (45516781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22758360 + 22758361.

It is an arithmetic number, because the mean of its divisors is an integer number (22758361).

Almost surely, 2^45516721 is an apocalyptic number.

It is an amenable number.

45516721 is a deficient number, since it is larger than the sum of its proper divisors (1).

45516721 is an equidigital number, since it uses as much as digits as its factorization.

45516721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 31.

The square root of 45516721 is about 6746.6081107472. The cubic root of 45516721 is about 357.0455758127.

The spelling of 45516721 in words is "forty-five million, five hundred sixteen thousand, seven hundred twenty-one".