51860987 has 2 divisors, whose sum is σ = 51860988. Its totient is φ = 51860986.

The previous prime is 51860983. The next prime is 51860993. The reversal of 51860987 is 78906815.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51860987 - 2² = 51860983 is a prime.

It is a super-2 number, since 2×51860987² = 5379123945228338, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51860983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25930493 + 25930494.

It is an arithmetic number, because the mean of its divisors is an integer number (25930494).

Almost surely, 2^51860987 is an apocalyptic number.

51860987 is a deficient number, since it is larger than the sum of its proper divisors (1).

51860987 is an equidigital number, since it uses as much as digits as its factorization.

51860987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 51860987 is about 7201.4572830782. The cubic root of 51860987 is about 372.9182114324.

The spelling of 51860987 in words is "fifty-one million, eight hundred sixty thousand, nine hundred eighty-seven".