45669721 has 2 divisors, whose sum is σ = 45669722. Its totient is φ = 45669720.

The previous prime is 45669719. The next prime is 45669761. The reversal of 45669721 is 12796654.

It is an a-pointer prime, because the next prime (45669761) can be obtained adding 45669721 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25644096 + 20025625 = 5064^2 + 4475^2 .

It is a cyclic number.

It is not a de Polignac number, because 45669721 - 2¹ = 45669719 is a prime.

Together with 45669719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (45669761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22834860 + 22834861.

It is an arithmetic number, because the mean of its divisors is an integer number (22834861).

Almost surely, 2^45669721 is an apocalyptic number.

It is an amenable number.

45669721 is a deficient number, since it is larger than the sum of its proper divisors (1).

45669721 is an equidigital number, since it uses as much as digits as its factorization.

45669721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The square root of 45669721 is about 6757.9376291884. The cubic root of 45669721 is about 357.4451863082.

The spelling of 45669721 in words is "forty-five million, six hundred sixty-nine thousand, seven hundred twenty-one".