45679981 has 2 divisors, whose sum is σ = 45679982. Its totient is φ = 45679980.

The previous prime is 45679943. The next prime is 45679993. The reversal of 45679981 is 18997654.

45679981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40576900 + 5103081 = 6370^2 + 2259^2 .

It is a cyclic number.

It is not a de Polignac number, because 45679981 - 2¹³ = 45671789 is a prime.

It is a super-2 number, since 2×45679981² = 4173321328320722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45673981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22839990 + 22839991.

It is an arithmetic number, because the mean of its divisors is an integer number (22839991).

Almost surely, 2^45679981 is an apocalyptic number.

It is an amenable number.

45679981 is a deficient number, since it is larger than the sum of its proper divisors (1).

45679981 is an equidigital number, since it uses as much as digits as its factorization.

45679981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 49.

The square root of 45679981 is about 6758.6966938900. The cubic root of 45679981 is about 357.4719517663.

The spelling of 45679981 in words is "forty-five million, six hundred seventy-nine thousand, nine hundred eighty-one".