45218381 has 8 divisors (see below), whose sum is σ = 49616280. Its totient is φ = 40951872.

The previous prime is 45218377. The next prime is 45218387. The reversal of 45218381 is 18381254.

It can be written as a sum of positive squares in 4 ways, for example, as 3822025 + 41396356 = 1955^2 + 6434^2 .

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

It is not a de Polignac number, because 45218381 - 2² = 45218377 is a prime.

It is a super-2 number, since 2×45218381² = 4089403960522322, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45218387) 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, 32126 + ... + 33503.

It is an arithmetic number, because the mean of its divisors is an integer number (6202035).

Almost surely, 2^45218381 is an apocalyptic number.

It is an amenable number.

45218381 is a deficient number, since it is larger than the sum of its proper divisors (4397899).

45218381 is a wasteful number, since it uses less digits than its factorization.

45218381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65695.

The product of its digits is 7680, while the sum is 32.

The square root of 45218381 is about 6724.4613910707. The cubic root of 45218381 is about 356.2637784350.

The spelling of 45218381 in words is "forty-five million, two hundred eighteen thousand, three hundred eighty-one".