51409679 has 4 divisors (see below), whose sum is σ = 51434880. Its totient is φ = 51384480.

The previous prime is 51409643. The next prime is 51409691. The reversal of 51409679 is 97690415.

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

It is a cyclic number.

It is not a de Polignac number, because 51409679 - 2²⁴ = 34632463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51459679) 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, 9242 + ... + 13719.

It is an arithmetic number, because the mean of its divisors is an integer number (12858720).

Almost surely, 2^51409679 is an apocalyptic number.

51409679 is a deficient number, since it is larger than the sum of its proper divisors (25201).

51409679 is a wasteful number, since it uses less digits than its factorization.

51409679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25200.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 51409679 is about 7170.0543233646. The cubic root of 51409679 is about 371.8333140572.

The spelling of 51409679 in words is "fifty-one million, four hundred nine thousand, six hundred seventy-nine".