691806148 has 24 divisors (see below), whose sum is σ = 1321397280. Its totient is φ = 314296320.

The previous prime is 691806139. The next prime is 691806149. The reversal of 691806148 is 841608196.

691806148 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (691806149) 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, 144115 + ... + 148837.

It is an arithmetic number, because the mean of its divisors is an integer number (55058220).

Almost surely, 2^691806148 is an apocalyptic number.

It is an amenable number.

691806148 is a deficient number, since it is larger than the sum of its proper divisors (629591132).

691806148 is a wasteful number, since it uses less digits than its factorization.

691806148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8067 (or 8065 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 691806148 is about 26302.2080441928. The cubic root of 691806148 is about 884.4259411412.

The spelling of 691806148 in words is "six hundred ninety-one million, eight hundred six thousand, one hundred forty-eight".