45444781 has 2 divisors, whose sum is σ = 45444782. Its totient is φ = 45444780.

The previous prime is 45444767. The next prime is 45444793. The reversal of 45444781 is 18744454.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44342281 + 1102500 = 6659^2 + 1050^2 .

It is a cyclic number.

It is not a de Polignac number, because 45444781 - 2¹⁵ = 45412013 is a prime.

It is a super-2 number, since 2×45444781² = 4130456240275922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 45444781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45444761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22722390 + 22722391.

It is an arithmetic number, because the mean of its divisors is an integer number (22722391).

Almost surely, 2^45444781 is an apocalyptic number.

It is an amenable number.

45444781 is a deficient number, since it is larger than the sum of its proper divisors (1).

45444781 is an equidigital number, since it uses as much as digits as its factorization.

45444781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71680, while the sum is 37.

The square root of 45444781 is about 6741.2744344078. The cubic root of 45444781 is about 356.8573709628.

It can be divided in two parts, 45444 and 781, that added together give a square (46225 = 215²).

The spelling of 45444781 in words is "forty-five million, four hundred forty-four thousand, seven hundred eighty-one".