45311921 has 2 divisors, whose sum is σ = 45311922. Its totient is φ = 45311920.

The previous prime is 45311897. The next prime is 45311923. The reversal of 45311921 is 12911354.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37994896 + 7317025 = 6164^2 + 2705^2 .

It is a cyclic number.

It is not a de Polignac number, because 45311921 - 2⁶ = 45311857 is a prime.

It is a Sophie Germain prime.

Together with 45311923, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (45311923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22655960 + 22655961.

It is an arithmetic number, because the mean of its divisors is an integer number (22655961).

Almost surely, 2^45311921 is an apocalyptic number.

It is an amenable number.

45311921 is a deficient number, since it is larger than the sum of its proper divisors (1).

45311921 is an equidigital number, since it uses as much as digits as its factorization.

45311921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 26.

The square root of 45311921 is about 6731.4130017404. The cubic root of 45311921 is about 356.5092682891.

The spelling of 45311921 in words is "forty-five million, three hundred eleven thousand, nine hundred twenty-one".