45559981 has 2 divisors, whose sum is σ = 45559982. Its totient is φ = 45559980.

The previous prime is 45559973. The next prime is 45559991. The reversal of 45559981 is 18995554.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44009956 + 1550025 = 6634^2 + 1245^2 .

It is a cyclic number.

It is not a de Polignac number, because 45559981 - 2³ = 45559973 is a prime.

It is a super-2 number, since 2×45559981² = 4151423737440722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45559931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22779990 + 22779991.

It is an arithmetic number, because the mean of its divisors is an integer number (22779991).

Almost surely, 2^45559981 is an apocalyptic number.

It is an amenable number.

45559981 is a deficient number, since it is larger than the sum of its proper divisors (1).

45559981 is an equidigital number, since it uses as much as digits as its factorization.

45559981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324000, while the sum is 46.

The square root of 45559981 is about 6749.8134048283. The cubic root of 45559981 is about 357.1586544098.

The spelling of 45559981 in words is "forty-five million, five hundred fifty-nine thousand, nine hundred eighty-one".