849791431 has 2 divisors, whose sum is σ = 849791432. Its totient is φ = 849791430.

The previous prime is 849791429. The next prime is 849791441. The reversal of 849791431 is 134197948.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 849791431 - 2¹ = 849791429 is a prime.

It is a super-2 number, since 2×849791431² = 1444290952402055522, which contains 22 as substring.

Together with 849791429, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (849791441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 424895715 + 424895716.

It is an arithmetic number, because the mean of its divisors is an integer number (424895716).

Almost surely, 2^849791431 is an apocalyptic number.

849791431 is a deficient number, since it is larger than the sum of its proper divisors (1).

849791431 is an equidigital number, since it uses as much as digits as its factorization.

849791431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The square root of 849791431 is about 29151.1823259366. The cubic root of 849791431 is about 947.1907521072.

The spelling of 849791431 in words is "eight hundred forty-nine million, seven hundred ninety-one thousand, four hundred thirty-one".