691310493 has 12 divisors (see below), whose sum is σ = 1015485120. Its totient is φ = 453061896.

The previous prime is 691310461. The next prime is 691310507. The reversal of 691310493 is 394013196.

It is not a de Polignac number, because 691310493 - 2⁵ = 691310461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691310443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 650421 + ... + 651482.

It is an arithmetic number, because the mean of its divisors is an integer number (84623760).

Almost surely, 2^691310493 is an apocalyptic number.

It is an amenable number.

691310493 is a deficient number, since it is larger than the sum of its proper divisors (324174627).

691310493 is a wasteful number, since it uses less digits than its factorization.

691310493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301968 (or 1301965 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 691310493 is about 26292.7840480996. The cubic root of 691310493 is about 884.2146705538.

The spelling of 691310493 in words is "six hundred ninety-one million, three hundred ten thousand, four hundred ninety-three".