855677621 has 2 divisors, whose sum is σ = 855677622. Its totient is φ = 855677620.

The previous prime is 855677617. The next prime is 855677639. The reversal of 855677621 is 126776558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 454116100 + 401561521 = 21310^2 + 20039^2 .

It is a cyclic number.

It is not a de Polignac number, because 855677621 - 2² = 855677617 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855677021) 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, 427838810 + 427838811.

It is an arithmetic number, because the mean of its divisors is an integer number (427838811).

Almost surely, 2^855677621 is an apocalyptic number.

It is an amenable number.

855677621 is a deficient number, since it is larger than the sum of its proper divisors (1).

855677621 is an equidigital number, since it uses as much as digits as its factorization.

855677621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 705600, while the sum is 47.

The square root of 855677621 is about 29251.9678141488. The cubic root of 855677621 is about 949.3726683818.

The spelling of 855677621 in words is "eight hundred fifty-five million, six hundred seventy-seven thousand, six hundred twenty-one".