51812663 has 4 divisors (see below), whose sum is σ = 59214480. Its totient is φ = 44410848.

The previous prime is 51812627. The next prime is 51812689. The reversal of 51812663 is 36621815.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 51812663 - 2¹⁴ = 51796279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51812603) 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, 3700898 + ... + 3700911.

It is an arithmetic number, because the mean of its divisors is an integer number (14803620).

Almost surely, 2^51812663 is an apocalyptic number.

51812663 is a deficient number, since it is larger than the sum of its proper divisors (7401817).

51812663 is an equidigital number, since it uses as much as digits as its factorization.

51812663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7401816.

The product of its digits is 8640, while the sum is 32.

The square root of 51812663 is about 7198.1013468831. The cubic root of 51812663 is about 372.8023472034.

The spelling of 51812663 in words is "fifty-one million, eight hundred twelve thousand, six hundred sixty-three".