45871921 has 2 divisors, whose sum is σ = 45871922. Its totient is φ = 45871920.

The previous prime is 45871919. The next prime is 45871937. The reversal of 45871921 is 12917854.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44076321 + 1795600 = 6639^2 + 1340^2 .

It is a cyclic number.

It is not a de Polignac number, because 45871921 - 2¹ = 45871919 is a prime.

Together with 45871919, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (45871901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22935960 + 22935961.

It is an arithmetic number, because the mean of its divisors is an integer number (22935961).

Almost surely, 2^45871921 is an apocalyptic number.

It is an amenable number.

45871921 is a deficient number, since it is larger than the sum of its proper divisors (1).

45871921 is an equidigital number, since it uses as much as digits as its factorization.

45871921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 37.

The square root of 45871921 is about 6772.8812923305. The cubic root of 45871921 is about 357.9719321960.

The spelling of 45871921 in words is "forty-five million, eight hundred seventy-one thousand, nine hundred twenty-one".