51493679 has 4 divisors (see below), whose sum is σ = 51623784. Its totient is φ = 51363576.

The previous prime is 51493649. The next prime is 51493681. The reversal of 51493679 is 97639415.

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 51493679 - 2⁸ = 51493423 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 (51493609) 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, 64457 + ... + 65250.

It is an arithmetic number, because the mean of its divisors is an integer number (12905946).

Almost surely, 2^51493679 is an apocalyptic number.

51493679 is a deficient number, since it is larger than the sum of its proper divisors (130105).

51493679 is a wasteful number, since it uses less digits than its factorization.

51493679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130104.

The product of its digits is 204120, while the sum is 44.

The square root of 51493679 is about 7175.9096287509. The cubic root of 51493679 is about 372.0357208347.

The spelling of 51493679 in words is "fifty-one million, four hundred ninety-three thousand, six hundred seventy-nine".