691163898 has 16 divisors (see below), whose sum is σ = 1387250496. Its totient is φ = 229567520.

The previous prime is 691163881. The next prime is 691163909. The reversal of 691163898 is 898361196.

691163898 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 691163898.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203286 + ... + 206657.

It is an arithmetic number, because the mean of its divisors is an integer number (86703156).

Almost surely, 2^691163898 is an apocalyptic number.

691163898 is an abundant number, since it is smaller than the sum of its proper divisors (696086598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

691163898 is a wasteful number, since it uses less digits than its factorization.

691163898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410229.

The product of its digits is 559872, while the sum is 51.

The square root of 691163898 is about 26289.9961582348. The cubic root of 691163898 is about 884.1521657824.

The spelling of 691163898 in words is "six hundred ninety-one million, one hundred sixty-three thousand, eight hundred ninety-eight".