691375097 has 8 divisors (see below), whose sum is σ = 831729600. Its totient is φ = 561417264.

The previous prime is 691375073. The next prime is 691375117. The reversal of 691375097 is 790573196.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 691375097 - 2⁶ = 691375033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691371097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2599022 + ... + 2599287.

It is an arithmetic number, because the mean of its divisors is an integer number (103966200).

Almost surely, 2^691375097 is an apocalyptic number.

It is an amenable number.

691375097 is a deficient number, since it is larger than the sum of its proper divisors (140354503).

691375097 is a wasteful number, since it uses less digits than its factorization.

691375097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5198335.

The product of its (nonzero) digits is 357210, while the sum is 47.

The square root of 691375097 is about 26294.0125694045. The cubic root of 691375097 is about 884.2422134238.

The spelling of 691375097 in words is "six hundred ninety-one million, three hundred seventy-five thousand, ninety-seven".