51813223 has 32 divisors (see below), whose sum is σ = 67092480. Its totient is φ = 38849760.

The previous prime is 51813221. The next prime is 51813233. The reversal of 51813223 is 32231815.

It is a cyclic number.

It is not a de Polignac number, because 51813223 - 2¹ = 51813221 is a prime.

It is a super-2 number, since 2×51813223² = 5369220155295458, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51813221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 372688 + ... + 372826.

It is an arithmetic number, because the mean of its divisors is an integer number (2096640).

Almost surely, 2^51813223 is an apocalyptic number.

51813223 is a deficient number, since it is larger than the sum of its proper divisors (15279257).

51813223 is a wasteful number, since it uses less digits than its factorization.

51813223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307.

The product of its digits is 1440, while the sum is 25.

The square root of 51813223 is about 7198.1402459246. The cubic root of 51813223 is about 372.8036903021.

The spelling of 51813223 in words is "fifty-one million, eight hundred thirteen thousand, two hundred twenty-three".