851421667 has 2 divisors, whose sum is σ = 851421668. Its totient is φ = 851421666.

The previous prime is 851421583. The next prime is 851421721. The reversal of 851421667 is 766124158.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-851421667 is a prime.

It is not a weakly prime, because it can be changed into another prime (851424667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425710833 + 425710834.

It is an arithmetic number, because the mean of its divisors is an integer number (425710834).

Almost surely, 2^851421667 is an apocalyptic number.

851421667 is a deficient number, since it is larger than the sum of its proper divisors (1).

851421667 is an equidigital number, since it uses as much as digits as its factorization.

851421667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 40.

The square root of 851421667 is about 29179.1306758786. The cubic root of 851421667 is about 947.7960606692.

The spelling of 851421667 in words is "eight hundred fifty-one million, four hundred twenty-one thousand, six hundred sixty-seven".