51690799 has 4 divisors (see below), whose sum is σ = 51873736. Its totient is φ = 51507864.

The previous prime is 51690797. The next prime is 51690839. The reversal of 51690799 is 99709615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99709615 = 5 ⋅19941923.

It is a cyclic number.

It is not a de Polignac number, because 51690799 - 2¹ = 51690797 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 (51690797) 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, 91044 + ... + 91609.

It is an arithmetic number, because the mean of its divisors is an integer number (12968434).

Almost surely, 2^51690799 is an apocalyptic number.

51690799 is a deficient number, since it is larger than the sum of its proper divisors (182937).

51690799 is a wasteful number, since it uses less digits than its factorization.

51690799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182936.

The product of its (nonzero) digits is 153090, while the sum is 46.

The square root of 51690799 is about 7189.6313535535. The cubic root of 51690799 is about 372.5098392368.

The spelling of 51690799 in words is "fifty-one million, six hundred ninety thousand, seven hundred ninety-nine".