51386999 has 2 divisors, whose sum is σ = 51387000. Its totient is φ = 51386998.

The previous prime is 51386987. The next prime is 51387013. The reversal of 51386999 is 99968315.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51386999 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51386939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25693499 + 25693500.

It is an arithmetic number, because the mean of its divisors is an integer number (25693500).

Almost surely, 2^51386999 is an apocalyptic number.

51386999 is a deficient number, since it is larger than the sum of its proper divisors (1).

51386999 is an equidigital number, since it uses as much as digits as its factorization.

51386999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 50.

The square root of 51386999 is about 7168.4725709177. The cubic root of 51386999 is about 371.7786264305.

The spelling of 51386999 in words is "fifty-one million, three hundred eighty-six thousand, nine hundred ninety-nine".