51099639 has 16 divisors (see below), whose sum is σ = 69947904. Its totient is φ = 33170400.

The previous prime is 51099619. The next prime is 51099641. The reversal of 51099639 is 93699015.

It is not a de Polignac number, because 51099639 - 2⁸ = 51099383 is a prime.

It is a super-2 number, since 2×51099639² = 5222346211860642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51099639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51099619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17494 + ... + 20204.

It is an arithmetic number, because the mean of its divisors is an integer number (4371744).

Almost surely, 2^51099639 is an apocalyptic number.

51099639 is a deficient number, since it is larger than the sum of its proper divisors (18848265).

51099639 is a wasteful number, since it uses less digits than its factorization.

51099639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2878.

The product of its (nonzero) digits is 65610, while the sum is 42.

The square root of 51099639 is about 7148.4011499076. The cubic root of 51099639 is about 371.0843258550.

The spelling of 51099639 in words is "fifty-one million, ninety-nine thousand, six hundred thirty-nine".