51994207 has 4 divisors (see below), whose sum is σ = 52114720. Its totient is φ = 51873696.

The previous prime is 51994193. The next prime is 51994247. The reversal of 51994207 is 70249915.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70249915 = 5 ⋅14049983.

It is a cyclic number.

It is not a de Polignac number, because 51994207 - 2¹¹ = 51992159 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 (51994247) 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, 59607 + ... + 60472.

It is an arithmetic number, because the mean of its divisors is an integer number (13028680).

Almost surely, 2^51994207 is an apocalyptic number.

51994207 is a deficient number, since it is larger than the sum of its proper divisors (120513).

51994207 is a wasteful number, since it uses less digits than its factorization.

51994207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120512.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 51994207 is about 7210.7008674608. The cubic root of 51994207 is about 373.2372546304.

The spelling of 51994207 in words is "fifty-one million, nine hundred ninety-four thousand, two hundred seven".