691111146 has 32 divisors (see below), whose sum is σ = 1509513408. Its totient is φ = 209200640.

The previous prime is 691111087. The next prime is 691111147. The reversal of 691111146 is 641111196.

It is a super-2 number, since 2×691111146² = 955269232250866632, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (691111147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61690 + ... + 72026.

It is an arithmetic number, because the mean of its divisors is an integer number (47172294).

Almost surely, 2^691111146 is an apocalyptic number.

691111146 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

691111146 is an abundant number, since it is smaller than the sum of its proper divisors (818402262).

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

691111146 is a wasteful number, since it uses less digits than its factorization.

691111146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11366.

The product of its digits is 1296, while the sum is 30.

The square root of 691111146 is about 26288.9928677384. The cubic root of 691111146 is about 884.1296713679.

The spelling of 691111146 in words is "six hundred ninety-one million, one hundred eleven thousand, one hundred forty-six".