691171040 has 192 divisors, whose sum is σ = 2041417728. Its totient is φ = 215654400.

The previous prime is 691171027. The next prime is 691171051. The reversal of 691171040 is 40171196.

It is a junction number, because it is equal to n+sod(n) for n = 691170994 and 691171012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 589655 + ... + 590825.

It is an arithmetic number, because the mean of its divisors is an integer number (10632384).

Almost surely, 2^691171040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691171040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1020708864).

691171040 is an abundant number, since it is smaller than the sum of its proper divisors (1350246688).

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

691171040 is a wasteful number, since it uses less digits than its factorization.

691171040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241 (or 1233 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 691171040 is about 26290.1319890182. The cubic root of 691171040 is about 884.1552111734.

The spelling of 691171040 in words is "six hundred ninety-one million, one hundred seventy-one thousand, forty".