51099951 has 32 divisors (see below), whose sum is σ = 83017728. Its totient is φ = 27324000.

The previous prime is 51099947. The next prime is 51099967. The reversal of 51099951 is 15999015.

It is not a de Polignac number, because 51099951 - 2² = 51099947 is a prime.

It is a super-2 number, since 2×51099951² = 5222409984404802, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51099901) 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, 21576 + ... + 23826.

It is an arithmetic number, because the mean of its divisors is an integer number (2594304).

Almost surely, 2^51099951 is an apocalyptic number.

51099951 is a deficient number, since it is larger than the sum of its proper divisors (31917777).

51099951 is a wasteful number, since it uses less digits than its factorization.

51099951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2331.

The product of its (nonzero) digits is 18225, while the sum is 39.

The square root of 51099951 is about 7148.4229729361. The cubic root of 51099951 is about 371.0850810989.

The spelling of 51099951 in words is "fifty-one million, ninety-nine thousand, nine hundred fifty-one".