51690007 has 4 divisors (see below), whose sum is σ = 51999696. Its totient is φ = 51380320.

The previous prime is 51689987. The next prime is 51690011. The reversal of 51690007 is 70009615.

It is a happy number.

51690007 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 51690007 - 2⁷ = 51689879 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 (51690097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154594 + ... + 154927.

It is an arithmetic number, because the mean of its divisors is an integer number (12999924).

Almost surely, 2^51690007 is an apocalyptic number.

51690007 is a deficient number, since it is larger than the sum of its proper divisors (309689).

51690007 is a wasteful number, since it uses less digits than its factorization.

51690007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309688.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 51690007 is about 7189.5762740234. The cubic root of 51690007 is about 372.5079367106.

The spelling of 51690007 in words is "fifty-one million, six hundred ninety thousand, seven".