691867797 has 4 divisors (see below), whose sum is σ = 922490400. Its totient is φ = 461245196.

The previous prime is 691867769. The next prime is 691867811. The reversal of 691867797 is 797768196.

It is a happy number.

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 not a de Polignac number, because 691867797 - 2⁶ = 691867733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 691867797.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691867727) by changing a digit.

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, 115311297 + ... + 115311302.

It is an arithmetic number, because the mean of its divisors is an integer number (230622600).

Almost surely, 2^691867797 is an apocalyptic number.

It is an amenable number.

691867797 is a deficient number, since it is larger than the sum of its proper divisors (230622603).

691867797 is a wasteful number, since it uses less digits than its factorization.

691867797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230622602.

The product of its digits is 8001504, while the sum is 60.

The square root of 691867797 is about 26303.3799539147. The cubic root of 691867797 is about 884.4522116774.

The spelling of 691867797 in words is "six hundred ninety-one million, eight hundred sixty-seven thousand, seven hundred ninety-seven".