51679699 has 4 divisors (see below), whose sum is σ = 51714736. Its totient is φ = 51644664.

The previous prime is 51679681. The next prime is 51679709. The reversal of 51679699 is 99697615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99697615 = 5 ⋅19939523.

It is a cyclic number.

It is not a de Polignac number, because 51679699 - 2²⁵ = 18125267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51679619) 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, 15204 + ... + 18289.

It is an arithmetic number, because the mean of its divisors is an integer number (12928684).

Almost surely, 2^51679699 is an apocalyptic number.

51679699 is a deficient number, since it is larger than the sum of its proper divisors (35037).

51679699 is a wasteful number, since it uses less digits than its factorization.

51679699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35036.

The product of its digits is 918540, while the sum is 52.

The square root of 51679699 is about 7188.8593671041. The cubic root of 51679699 is about 372.4831732711.

The spelling of 51679699 in words is "fifty-one million, six hundred seventy-nine thousand, six hundred ninety-nine".