45551521 has 2 divisors, whose sum is σ = 45551522. Its totient is φ = 45551520.

The previous prime is 45551497. The next prime is 45551537. The reversal of 45551521 is 12515554.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24059025 + 21492496 = 4905^2 + 4636^2 .

It is a cyclic number.

It is not a de Polignac number, because 45551521 - 2⁷ = 45551393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 45551521.

It is not a weakly prime, because it can be changed into another prime (45551581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22775760 + 22775761.

It is an arithmetic number, because the mean of its divisors is an integer number (22775761).

Almost surely, 2^45551521 is an apocalyptic number.

It is an amenable number.

45551521 is a deficient number, since it is larger than the sum of its proper divisors (1).

45551521 is an equidigital number, since it uses as much as digits as its factorization.

45551521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5000, while the sum is 28.

The square root of 45551521 is about 6749.1866917429. The cubic root of 45551521 is about 357.1365461971.

The spelling of 45551521 in words is "forty-five million, five hundred fifty-one thousand, five hundred twenty-one".