691357894 has 8 divisors (see below), whose sum is σ = 1037174328. Its totient is φ = 345633120.

The previous prime is 691357889. The next prime is 691357967. The reversal of 691357894 is 498753196.

It is a happy number.

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

It is a super-2 number, since 2×691357894² = 955951475192230472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 889 + ... + 37195.

It is an arithmetic number, because the mean of its divisors is an integer number (129646791).

Almost surely, 2^691357894 is an apocalyptic number.

691357894 is a deficient number, since it is larger than the sum of its proper divisors (345816434).

691357894 is a wasteful number, since it uses less digits than its factorization.

691357894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45830.

The product of its digits is 1632960, while the sum is 52.

The square root of 691357894 is about 26293.6854396640. The cubic root of 691357894 is about 884.2348793708.

The spelling of 691357894 in words is "six hundred ninety-one million, three hundred fifty-seven thousand, eight hundred ninety-four".