691473347 has 2 divisors, whose sum is σ = 691473348. Its totient is φ = 691473346.

The previous prime is 691473337. The next prime is 691473359. The reversal of 691473347 is 743374196.

691473347 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 691473347 - 2¹⁰ = 691472323 is a prime.

It is a super-2 number, since 2×691473347² = 956270779222764818, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 691473298 and 691473307.

It is not a weakly prime, because it can be changed into another prime (691473337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345736673 + 345736674.

It is an arithmetic number, because the mean of its divisors is an integer number (345736674).

Almost surely, 2^691473347 is an apocalyptic number.

691473347 is a deficient number, since it is larger than the sum of its proper divisors (1).

691473347 is an equidigital number, since it uses as much as digits as its factorization.

691473347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 44.

The square root of 691473347 is about 26295.8807990909. The cubic root of 691473347 is about 884.2840974329.

The spelling of 691473347 in words is "six hundred ninety-one million, four hundred seventy-three thousand, three hundred forty-seven".