691992231 has 8 divisors (see below), whose sum is σ = 1054464384. Its totient is φ = 395424120.

The previous prime is 691992209. The next prime is 691992239. The reversal of 691992231 is 132299196.

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

It is not a de Polignac number, because 691992231 - 2⁹ = 691991719 is a prime.

It is a super-2 number, since 2×691992231² = 957706495528714722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691992239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16475985 + ... + 16476026.

It is an arithmetic number, because the mean of its divisors is an integer number (131808048).

Almost surely, 2^691992231 is an apocalyptic number.

691992231 is a deficient number, since it is larger than the sum of its proper divisors (362472153).

691992231 is a wasteful number, since it uses less digits than its factorization.

691992231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32952021.

The product of its digits is 52488, while the sum is 42.

The square root of 691992231 is about 26305.7452089843. The cubic root of 691992231 is about 884.5052320809.

The spelling of 691992231 in words is "six hundred ninety-one million, nine hundred ninety-two thousand, two hundred thirty-one".