691010097 has 4 divisors (see below), whose sum is σ = 921346800. Its totient is φ = 460673396.

The previous prime is 691010087. The next prime is 691010123. The reversal of 691010097 is 790010196.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-691010097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (691010087) 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 3 ways as a sum of consecutive naturals, for example, 115168347 + ... + 115168352.

It is an arithmetic number, because the mean of its divisors is an integer number (230336700).

Almost surely, 2^691010097 is an apocalyptic number.

It is an amenable number.

691010097 is a deficient number, since it is larger than the sum of its proper divisors (230336703).

691010097 is a wasteful number, since it uses less digits than its factorization.

691010097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230336702.

The product of its (nonzero) digits is 3402, while the sum is 33.

The square root of 691010097 is about 26287.0709094794. The cubic root of 691010097 is about 884.0865790354.

Subtracting 691010097 from its reverse (790010196), we obtain a palindrome (99000099).

The spelling of 691010097 in words is "six hundred ninety-one million, ten thousand, ninety-seven".