45571921 has 2 divisors, whose sum is σ = 45571922. Its totient is φ = 45571920.

The previous prime is 45571909. The next prime is 45571931. The reversal of 45571921 is 12917554.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24641296 + 20930625 = 4964^2 + 4575^2 .

It is a cyclic number.

It is not a de Polignac number, because 45571921 - 2⁷ = 45571793 is a prime.

It is not a weakly prime, because it can be changed into another prime (45571931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22785960 + 22785961.

It is an arithmetic number, because the mean of its divisors is an integer number (22785961).

Almost surely, 2^45571921 is an apocalyptic number.

It is an amenable number.

45571921 is a deficient number, since it is larger than the sum of its proper divisors (1).

45571921 is an equidigital number, since it uses as much as digits as its factorization.

45571921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 34.

The square root of 45571921 is about 6750.6978157817. The cubic root of 45571921 is about 357.1898521244.

The spelling of 45571921 in words is "forty-five million, five hundred seventy-one thousand, nine hundred twenty-one".