45551581 has 2 divisors, whose sum is σ = 45551582. Its totient is φ = 45551580.

The previous prime is 45551579. The next prime is 45551587. The reversal of 45551581 is 18515554.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43099225 + 2452356 = 6565^2 + 1566^2 .

It is a cyclic number.

It is not a de Polignac number, because 45551581 - 2¹ = 45551579 is a prime.

It is a super-2 number, since 2×45551581² = 4149893063199122, which contains 22 as substring.

Together with 45551579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45551587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22775790 + 22775791.

It is an arithmetic number, because the mean of its divisors is an integer number (22775791).

Almost surely, 2^45551581 is an apocalyptic number.

It is an amenable number.

45551581 is a deficient number, since it is larger than the sum of its proper divisors (1).

45551581 is an equidigital number, since it uses as much as digits as its factorization.

45551581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20000, while the sum is 34.

The square root of 45551581 is about 6749.1911367215. The cubic root of 45551581 is about 357.1367030025.

The spelling of 45551581 in words is "forty-five million, five hundred fifty-one thousand, five hundred eighty-one".