691230961 has 8 divisors (see below), whose sum is σ = 711849600. Its totient is φ = 670909200.

The previous prime is 691230923. The next prime is 691230973. The reversal of 691230961 is 169032196.

691230961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 691230961 - 2¹⁷ = 691099889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 691230961.

It is not an unprimeable number, because it can be changed into a prime (691230161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69490 + ... + 78811.

It is an arithmetic number, because the mean of its divisors is an integer number (88981200).

Almost surely, 2^691230961 is an apocalyptic number.

It is an amenable number.

691230961 is a deficient number, since it is larger than the sum of its proper divisors (20618639).

691230961 is a wasteful number, since it uses less digits than its factorization.

691230961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148439.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 691230961 is about 26291.2715744218. The cubic root of 691230961 is about 884.1807610158.

It can be divided in two parts, 6912 and 30961, that added together give a palindrome (37873).

The spelling of 691230961 in words is "six hundred ninety-one million, two hundred thirty thousand, nine hundred sixty-one".