51236687 has 2 divisors, whose sum is σ = 51236688. Its totient is φ = 51236686.

The previous prime is 51236683. The next prime is 51236701. The reversal of 51236687 is 78663215.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51236687 - 2² = 51236683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51236687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51236683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25618343 + 25618344.

It is an arithmetic number, because the mean of its divisors is an integer number (25618344).

Almost surely, 2^51236687 is an apocalyptic number.

51236687 is a deficient number, since it is larger than the sum of its proper divisors (1).

51236687 is an equidigital number, since it uses as much as digits as its factorization.

51236687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The square root of 51236687 is about 7157.9806509937. The cubic root of 51236687 is about 371.4157761230.

The spelling of 51236687 in words is "fifty-one million, two hundred thirty-six thousand, six hundred eighty-seven".