45428021 has 2 divisors, whose sum is σ = 45428022. Its totient is φ = 45428020.

The previous prime is 45428017. The next prime is 45428023. The reversal of 45428021 is 12082454.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37075921 + 8352100 = 6089^2 + 2890^2 .

It is a cyclic number.

It is not a de Polignac number, because 45428021 - 2² = 45428017 is a prime.

Together with 45428023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45428023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22714010 + 22714011.

It is an arithmetic number, because the mean of its divisors is an integer number (22714011).

Almost surely, 2^45428021 is an apocalyptic number.

It is an amenable number.

45428021 is a deficient number, since it is larger than the sum of its proper divisors (1).

45428021 is an equidigital number, since it uses as much as digits as its factorization.

45428021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 45428021 is about 6740.0312313816. The cubic root of 45428021 is about 356.8134959947.

The spelling of 45428021 in words is "forty-five million, four hundred twenty-eight thousand, twenty-one".