45039281 has 6 divisors (see below), whose sum is σ = 52392690. Its totient is φ = 38605056.

The previous prime is 45039277. The next prime is 45039287. The reversal of 45039281 is 18293054.

It can be written as a sum of positive squares in only one way, i.e., 42837025 + 2202256 = 6545^2 + 1484^2 .

It is not a de Polignac number, because 45039281 - 2² = 45039277 is a prime.

It is a super-2 number, since 2×45039281² = 4057073665993922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (45039287) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 459536 + ... + 459633.

It is an arithmetic number, because the mean of its divisors is an integer number (8732115).

Almost surely, 2^45039281 is an apocalyptic number.

It is an amenable number.

45039281 is a deficient number, since it is larger than the sum of its proper divisors (7353409).

45039281 is an equidigital number, since it uses as much as digits as its factorization.

45039281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919183 (or 919176 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 45039281 is about 6711.1311267178. The cubic root of 45039281 is about 355.7927954058.

The spelling of 45039281 in words is "forty-five million, thirty-nine thousand, two hundred eighty-one".