691498122 has 128 divisors (see below), whose sum is σ = 1725235200. Its totient is φ = 180398016.

The previous prime is 691498111. The next prime is 691498147. The reversal of 691498122 is 221894196.

691498122 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3863029 + ... + 3863207.

It is an arithmetic number, because the mean of its divisors is an integer number (13478400).

Almost surely, 2^691498122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691498122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (862617600).

691498122 is an abundant number, since it is smaller than the sum of its proper divisors (1033737078).

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

691498122 is a wasteful number, since it uses less digits than its factorization.

691498122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360.

The product of its digits is 62208, while the sum is 42.

The square root of 691498122 is about 26296.3518762584. The cubic root of 691498122 is about 884.2946583976.

The spelling of 691498122 in words is "six hundred ninety-one million, four hundred ninety-eight thousand, one hundred twenty-two".