51020887 has 2 divisors, whose sum is σ = 51020888. Its totient is φ = 51020886.

The previous prime is 51020873. The next prime is 51020929. The reversal of 51020887 is 78802015.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51020887 - 2¹⁹ = 50496599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51020867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25510443 + 25510444.

It is an arithmetic number, because the mean of its divisors is an integer number (25510444).

Almost surely, 2^51020887 is an apocalyptic number.

51020887 is a deficient number, since it is larger than the sum of its proper divisors (1).

51020887 is an equidigital number, since it uses as much as digits as its factorization.

51020887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 51020887 is about 7142.8906613499. The cubic root of 51020887 is about 370.8935961428.

The spelling of 51020887 in words is "fifty-one million, twenty thousand, eight hundred eighty-seven".