45679721 has 2 divisors, whose sum is σ = 45679722. Its totient is φ = 45679720.

The previous prime is 45679703. The next prime is 45679757. The reversal of 45679721 is 12797654.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44089600 + 1590121 = 6640^2 + 1261^2 .

It is a cyclic number.

It is not a de Polignac number, because 45679721 - 2⁶ = 45679657 is a prime.

It is not a weakly prime, because it can be changed into another prime (45679121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22839860 + 22839861.

It is an arithmetic number, because the mean of its divisors is an integer number (22839861).

Almost surely, 2^45679721 is an apocalyptic number.

It is an amenable number.

45679721 is a deficient number, since it is larger than the sum of its proper divisors (1).

45679721 is an equidigital number, since it uses as much as digits as its factorization.

45679721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 41.

The square root of 45679721 is about 6758.6774593851. The cubic root of 45679721 is about 357.4712735488.

The spelling of 45679721 in words is "forty-five million, six hundred seventy-nine thousand, seven hundred twenty-one".