45881509 has 8 divisors (see below), whose sum is σ = 47731320. Its totient is φ = 44049600.

The previous prime is 45881489. The next prime is 45881531. The reversal of 45881509 is 90518854.

It can be written as a sum of positive squares in 4 ways, for example, as 521284 + 45360225 = 722^2 + 6735^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 45881509 - 2⁵ = 45881477 is a prime.

It is a super-2 number, since 2×45881509² = 4210225736234162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45881579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 879 + ... + 9619.

It is an arithmetic number, because the mean of its divisors is an integer number (5966415).

Almost surely, 2^45881509 is an apocalyptic number.

It is an amenable number.

45881509 is a deficient number, since it is larger than the sum of its proper divisors (1849811).

45881509 is a wasteful number, since it uses less digits than its factorization.

45881509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8951.

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 45881509 is about 6773.5890781771. The cubic root of 45881509 is about 357.9968711689.

The spelling of 45881509 in words is "forty-five million, eight hundred eighty-one thousand, five hundred nine".