2856551 has 2 divisors, whose sum is σ = 2856552. Its totient is φ = 2856550.

The previous prime is 2856547. The next prime is 2856559. The reversal of 2856551 is 1556582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2856551 - 2² = 2856547 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2856559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1428275 + 1428276.

It is an arithmetic number, because the mean of its divisors is an integer number (1428276).

2^2856551 is an apocalyptic number.

2856551 is a deficient number, since it is larger than the sum of its proper divisors (1).

2856551 is an equidigital number, since it uses as much as digits as its factorization.

2856551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12000, while the sum is 32.

The square root of 2856551 is about 1690.1334266856. The cubic root of 2856551 is about 141.8885424399. Note that the first 3 decimals are identical.

The spelling of 2856551 in words is "two million, eight hundred fifty-six thousand, five hundred fifty-one".