691297494 has 8 divisors (see below), whose sum is σ = 1382595000. Its totient is φ = 230432496.

The previous prime is 691297493. The next prime is 691297531. The reversal of 691297494 is 494792196.

It is a happy number.

691297494 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

691297494 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691297493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57608119 + ... + 57608130.

It is an arithmetic number, because the mean of its divisors is an integer number (172824375).

Almost surely, 2^691297494 is an apocalyptic number.

691297494 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

691297494 is a wasteful number, since it uses less digits than its factorization.

691297494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115216254.

The product of its digits is 979776, while the sum is 51.

The square root of 691297494 is about 26292.5368498363. The cubic root of 691297494 is about 884.2091284331.

The spelling of 691297494 in words is "six hundred ninety-one million, two hundred ninety-seven thousand, four hundred ninety-four".