691834379 has 2 divisors, whose sum is σ = 691834380. Its totient is φ = 691834378.

The previous prime is 691834357. The next prime is 691834421. The reversal of 691834379 is 973438196.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 691834379 - 2¹⁶ = 691768843 is a prime.

It is not a weakly prime, because it can be changed into another prime (691833379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345917189 + 345917190.

It is an arithmetic number, because the mean of its divisors is an integer number (345917190).

Almost surely, 2^691834379 is an apocalyptic number.

691834379 is a deficient number, since it is larger than the sum of its proper divisors (1).

691834379 is an equidigital number, since it uses as much as digits as its factorization.

691834379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 50.

The square root of 691834379 is about 26302.7447046881. The cubic root of 691834379 is about 884.4379714328.

The spelling of 691834379 in words is "six hundred ninety-one million, eight hundred thirty-four thousand, three hundred seventy-nine".