51818687 has 2 divisors, whose sum is σ = 51818688. Its totient is φ = 51818686.

The previous prime is 51818677. The next prime is 51818731. The reversal of 51818687 is 78681815.

It is an a-pointer prime, because the next prime (51818731) can be obtained adding 51818687 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51818687 - 2²² = 47624383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51818647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25909343 + 25909344.

It is an arithmetic number, because the mean of its divisors is an integer number (25909344).

Almost surely, 2^51818687 is an apocalyptic number.

51818687 is a deficient number, since it is larger than the sum of its proper divisors (1).

51818687 is an equidigital number, since it uses as much as digits as its factorization.

51818687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 107520, while the sum is 44.

The square root of 51818687 is about 7198.5197783989. The cubic root of 51818687 is about 372.8167946002.

The spelling of 51818687 in words is "fifty-one million, eight hundred eighteen thousand, six hundred eighty-seven".