51238807 has 4 divisors (see below), whose sum is σ = 52488576. Its totient is φ = 49989040.

The previous prime is 51238777. The next prime is 51238819. The reversal of 51238807 is 70883215.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51238807 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 (51238897) 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, 624823 + ... + 624904.

It is an arithmetic number, because the mean of its divisors is an integer number (13122144).

Almost surely, 2^51238807 is an apocalyptic number.

51238807 is a deficient number, since it is larger than the sum of its proper divisors (1249769).

51238807 is a wasteful number, since it uses less digits than its factorization.

51238807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249768.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 51238807 is about 7158.1287359197. The cubic root of 51238807 is about 371.4208986933.

The spelling of 51238807 in words is "fifty-one million, two hundred thirty-eight thousand, eight hundred seven".