51040207 has 4 divisors (see below), whose sum is σ = 51263320. Its totient is φ = 50817096.

The previous prime is 51040193. The next prime is 51040211. The reversal of 51040207 is 70204015.

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-51040207 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 (51040217) 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, 111213 + ... + 111670.

It is an arithmetic number, because the mean of its divisors is an integer number (12815830).

Almost surely, 2^51040207 is an apocalyptic number.

51040207 is a deficient number, since it is larger than the sum of its proper divisors (223113).

51040207 is a wasteful number, since it uses less digits than its factorization.

51040207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223112.

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

The square root of 51040207 is about 7144.2429270007. The cubic root of 51040207 is about 370.9404054688.

The spelling of 51040207 in words is "fifty-one million, forty thousand, two hundred seven".