51663259 has 4 divisors (see below), whose sum is σ = 51678000. Its totient is φ = 51648520.

The previous prime is 51663257. The next prime is 51663263. The reversal of 51663259 is 95236615.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 51663259 - 2¹ = 51663257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51663251) 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, 1242 + ... + 10240.

It is an arithmetic number, because the mean of its divisors is an integer number (12919500).

Almost surely, 2^51663259 is an apocalyptic number.

51663259 is a deficient number, since it is larger than the sum of its proper divisors (14741).

51663259 is an equidigital number, since it uses as much as digits as its factorization.

51663259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14740.

The product of its digits is 48600, while the sum is 37.

The square root of 51663259 is about 7187.7158402374. The cubic root of 51663259 is about 372.4436717974.

The spelling of 51663259 in words is "fifty-one million, six hundred sixty-three thousand, two hundred fifty-nine".