1691044998 has 8 divisors (see below), whose sum is σ = 3382090008. Its totient is φ = 563681664.

The previous prime is 1691044997. The next prime is 1691045017. The reversal of 1691044998 is 8994401961.

It is a sphenic number, since it is the product of 3 distinct primes.

1691044998 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 1691044998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691044997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140920411 + ... + 140920422.

It is an arithmetic number, because the mean of its divisors is an integer number (422761251).

Almost surely, 2^1691044998 is an apocalyptic number.

1691044998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1691044998 is a wasteful number, since it uses less digits than its factorization.

1691044998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281840838.

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

The square root of 1691044998 is about 41122.3175173773. The cubic root of 1691044998 is about 1191.3838849208.

The spelling of 1691044998 in words is "one billion, six hundred ninety-one million, forty-four thousand, nine hundred ninety-eight".