45257281 has 4 divisors (see below), whose sum is σ = 47919492. Its totient is φ = 42595072.

The previous prime is 45257263. The next prime is 45257351. The reversal of 45257281 is 18275254.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29257281 + 16000000 = 5409^2 + 4000^2 .

It is a cyclic number.

It is not a de Polignac number, because 45257281 - 2⁵ = 45257249 is a prime.

It is a super-2 number, since 2×45257281² = 4096442967025922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45255281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1331080 + ... + 1331113.

It is an arithmetic number, because the mean of its divisors is an integer number (11979873).

Almost surely, 2^45257281 is an apocalyptic number.

It is an amenable number.

45257281 is a deficient number, since it is larger than the sum of its proper divisors (2662211).

45257281 is a wasteful number, since it uses less digits than its factorization.

45257281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2662210.

The product of its digits is 22400, while the sum is 34.

The square root of 45257281 is about 6727.3531942362. The cubic root of 45257281 is about 356.3659101236.

The spelling of 45257281 in words is "forty-five million, two hundred fifty-seven thousand, two hundred eighty-one".