45921521 has 4 divisors (see below), whose sum is σ = 45935472. Its totient is φ = 45907572.

The previous prime is 45921497. The next prime is 45921541. The reversal of 45921521 is 12512954.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 45921521 - 2⁶ = 45921457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (45921541) 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, 1010 + ... + 9636.

It is an arithmetic number, because the mean of its divisors is an integer number (11483868).

Almost surely, 2^45921521 is an apocalyptic number.

It is an amenable number.

45921521 is a deficient number, since it is larger than the sum of its proper divisors (13951).

45921521 is an equidigital number, since it uses as much as digits as its factorization.

45921521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13950.

The product of its digits is 3600, while the sum is 29.

The square root of 45921521 is about 6776.5419647487. The cubic root of 45921521 is about 358.1009073354.

The spelling of 45921521 in words is "forty-five million, nine hundred twenty-one thousand, five hundred twenty-one".