691687463 has 4 divisors (see below), whose sum is σ = 692842800. Its totient is φ = 690532128.

The previous prime is 691687459. The next prime is 691687499. The reversal of 691687463 is 364786196.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 691687463 - 2² = 691687459 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691687433) 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, 576770 + ... + 577967.

It is an arithmetic number, because the mean of its divisors is an integer number (173210700).

Almost surely, 2^691687463 is an apocalyptic number.

691687463 is a deficient number, since it is larger than the sum of its proper divisors (1155337).

691687463 is a wasteful number, since it uses less digits than its factorization.

691687463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155336.

The product of its digits is 1306368, while the sum is 50.

The square root of 691687463 is about 26299.9517680166. The cubic root of 691687463 is about 884.3753614153.

The spelling of 691687463 in words is "six hundred ninety-one million, six hundred eighty-seven thousand, four hundred sixty-three".