51400207 has 4 divisors (see below), whose sum is σ = 51446016. Its totient is φ = 51354400.

The previous prime is 51400177. The next prime is 51400229. The reversal of 51400207 is 70200415.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70200415 = 5 ⋅14040083.

It is a cyclic number.

It is not a de Polignac number, because 51400207 - 2⁷ = 51400079 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 (51400507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21178 + ... + 23479.

It is an arithmetic number, because the mean of its divisors is an integer number (12861504).

Almost surely, 2^51400207 is an apocalyptic number.

51400207 is a deficient number, since it is larger than the sum of its proper divisors (45809).

51400207 is a wasteful number, since it uses less digits than its factorization.

51400207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45808.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 51400207 is about 7169.3937679556. The cubic root of 51400207 is about 371.8104764544.

The spelling of 51400207 in words is "fifty-one million, four hundred thousand, two hundred seven".