691032443 has 2 divisors, whose sum is σ = 691032444. Its totient is φ = 691032442.

The previous prime is 691032431. The next prime is 691032487. The reversal of 691032443 is 344230196.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 691032443 - 2⁴ = 691032427 is a prime.

It is not a weakly prime, because it can be changed into another prime (691032343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345516221 + 345516222.

It is an arithmetic number, because the mean of its divisors is an integer number (345516222).

Almost surely, 2^691032443 is an apocalyptic number.

691032443 is a deficient number, since it is larger than the sum of its proper divisors (1).

691032443 is an equidigital number, since it uses as much as digits as its factorization.

691032443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 691032443 is about 26287.4959438894. The cubic root of 691032443 is about 884.0961088459.

The spelling of 691032443 in words is "six hundred ninety-one million, thirty-two thousand, four hundred forty-three".