51099959 has 4 divisors (see below), whose sum is σ = 51966120. Its totient is φ = 50233800.

The previous prime is 51099947. The next prime is 51099967. The reversal of 51099959 is 95999015.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51099959 is a prime.

It is a super-2 number, since 2×51099959² = 5222411619603362, 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 (51099989) 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, 432992 + ... + 433109.

It is an arithmetic number, because the mean of its divisors is an integer number (12991530).

Almost surely, 2^51099959 is an apocalyptic number.

51099959 is a gapful number since it is divisible by the number (59) formed by its first and last digit.

51099959 is a deficient number, since it is larger than the sum of its proper divisors (866161).

51099959 is an equidigital number, since it uses as much as digits as its factorization.

51099959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866160.

The product of its (nonzero) digits is 164025, while the sum is 47.

The square root of 51099959 is about 7148.4235325000. The cubic root of 51099959 is about 371.0851004641.

The spelling of 51099959 in words is "fifty-one million, ninety-nine thousand, nine hundred fifty-nine".