45117681 has 24 divisors (see below), whose sum is σ = 71311104. Its totient is φ = 25290720.

The previous prime is 45117661. The next prime is 45117719. The reversal of 45117681 is 18671154.

It is a happy number.

It is not a de Polignac number, because 45117681 - 2¹³ = 45109489 is a prime.

It is a super-2 number, since 2×45117681² = 4071210277635522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (45117661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4896 + ... + 10686.

It is an arithmetic number, because the mean of its divisors is an integer number (2971296).

Almost surely, 2^45117681 is an apocalyptic number.

It is an amenable number.

45117681 is a deficient number, since it is larger than the sum of its proper divisors (26193423).

45117681 is a wasteful number, since it uses less digits than its factorization.

45117681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5861 (or 5854 counting only the distinct ones).

The product of its digits is 6720, while the sum is 33.

The square root of 45117681 is about 6716.9696292301. The cubic root of 45117681 is about 355.9991189012. Note that the first 3 decimals are identical.

The spelling of 45117681 in words is "forty-five million, one hundred seventeen thousand, six hundred eighty-one".