691431230 has 16 divisors (see below), whose sum is σ = 1422372960. Its totient is φ = 237062112.

The previous prime is 691431227. The next prime is 691431263. The reversal of 691431230 is 32134196.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 691431193 and 691431202.

It is a congruent number.

It is an unprimeable number.

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, 4938725 + ... + 4938864.

It is an arithmetic number, because the mean of its divisors is an integer number (88898310).

Almost surely, 2^691431230 is an apocalyptic number.

691431230 is an abundant number, since it is smaller than the sum of its proper divisors (730941730).

691431230 is a wasteful number, since it uses less digits than its factorization.

691431230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9877603.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 691431230 is about 26295.0799580454. The cubic root of 691431230 is about 884.2661434271.

The spelling of 691431230 in words is "six hundred ninety-one million, four hundred thirty-one thousand, two hundred thirty".