51699698 has 8 divisors (see below), whose sum is σ = 79012908. Its totient is φ = 25362064.

The previous prime is 51699691. The next prime is 51699709. The reversal of 51699698 is 89699615.

It can be written as a sum of positive squares in 2 ways, for example, as 40921609 + 10778089 = 6397^2 + 3283^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51699691) 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, 243761 + ... + 243972.

Almost surely, 2^51699698 is an apocalyptic number.

51699698 is a deficient number, since it is larger than the sum of its proper divisors (27313210).

51699698 is a wasteful number, since it uses less digits than its factorization.

51699698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487788.

The product of its digits is 1049760, while the sum is 53.

The square root of 51699698 is about 7190.2502042697. The cubic root of 51699698 is about 372.5312148969.

The spelling of 51699698 in words is "fifty-one million, six hundred ninety-nine thousand, six hundred ninety-eight".