51394691 has 4 divisors (see below), whose sum is σ = 51417000. Its totient is φ = 51372384.

The previous prime is 51394669. The next prime is 51394697. The reversal of 51394691 is 19649315.

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 51394691 - 2¹⁴ = 51378307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51394697) 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, 7241 + ... + 12458.

It is an arithmetic number, because the mean of its divisors is an integer number (12854250).

Almost surely, 2^51394691 is an apocalyptic number.

51394691 is a deficient number, since it is larger than the sum of its proper divisors (22309).

51394691 is a wasteful number, since it uses less digits than its factorization.

51394691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22308.

The product of its digits is 29160, while the sum is 38.

The square root of 51394691 is about 7169.0090668097. The cubic root of 51394691 is about 371.7971757301.

The spelling of 51394691 in words is "fifty-one million, three hundred ninety-four thousand, six hundred ninety-one".