851438459 has 2 divisors, whose sum is σ = 851438460. Its totient is φ = 851438458.

The previous prime is 851438447. The next prime is 851438477. The reversal of 851438459 is 954834158.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-851438459 is a prime.

It is not a weakly prime, because it can be changed into another prime (851438429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425719229 + 425719230.

It is an arithmetic number, because the mean of its divisors is an integer number (425719230).

Almost surely, 2^851438459 is an apocalyptic number.

851438459 is a deficient number, since it is larger than the sum of its proper divisors (1).

851438459 is an equidigital number, since it uses as much as digits as its factorization.

851438459 is an evil number, because the sum of its binary digits is even.

The product of its digits is 691200, while the sum is 47.

The square root of 851438459 is about 29179.4184143550. The cubic root of 851438459 is about 947.8022915367.

The spelling of 851438459 in words is "eight hundred fifty-one million, four hundred thirty-eight thousand, four hundred fifty-nine".