45391561 has 2 divisors, whose sum is σ = 45391562. Its totient is φ = 45391560.

The previous prime is 45391559. The next prime is 45391571. The reversal of 45391561 is 16519354.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33419961 + 11971600 = 5781^2 + 3460^2 .

It is a cyclic number.

It is not a de Polignac number, because 45391561 - 2¹ = 45391559 is a prime.

Together with 45391559, it forms a pair of twin primes.

It is equal to p_2740498 and since 45391561 and 2740498 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (45391501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22695780 + 22695781.

It is an arithmetic number, because the mean of its divisors is an integer number (22695781).

Almost surely, 2^45391561 is an apocalyptic number.

It is an amenable number.

45391561 is a deficient number, since it is larger than the sum of its proper divisors (1).

45391561 is an equidigital number, since it uses as much as digits as its factorization.

45391561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 34.

The square root of 45391561 is about 6737.3259532251. The cubic root of 45391561 is about 356.7180123282.

The spelling of 45391561 in words is "forty-five million, three hundred ninety-one thousand, five hundred sixty-one".