51207399 has 12 divisors (see below), whose sum is σ = 74030112. Its totient is φ = 34108800.

The previous prime is 51207391. The next prime is 51207421. The reversal of 51207399 is 99370215.

It is not a de Polignac number, because 51207399 - 2³ = 51207391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51207391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15319 + ... + 18359.

It is an arithmetic number, because the mean of its divisors is an integer number (6169176).

Almost surely, 2^51207399 is an apocalyptic number.

51207399 is a deficient number, since it is larger than the sum of its proper divisors (22822713).

51207399 is a wasteful number, since it uses less digits than its factorization.

51207399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4918 (or 4915 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 51207399 is about 7155.9345301645. The cubic root of 51207399 is about 371.3449928669.

The spelling of 51207399 in words is "fifty-one million, two hundred seven thousand, three hundred ninety-nine".