990698697 has 6 divisors (see below), whose sum is σ = 1431009242. Its totient is φ = 660465792.

The previous prime is 990698689. The next prime is 990698699. The reversal of 990698697 is 796896099.

It can be written as a sum of positive squares in only one way, i.e., 887086656 + 103612041 = 29784^2 + 10179^2 .

It is not a de Polignac number, because 990698697 - 2³ = 990698689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990698699) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55038808 + ... + 55038825.

Almost surely, 2^990698697 is an apocalyptic number.

It is an amenable number.

990698697 is a deficient number, since it is larger than the sum of its proper divisors (440310545).

990698697 is a wasteful number, since it uses less digits than its factorization.

990698697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110077639 (or 110077636 counting only the distinct ones).

The product of its (nonzero) digits is 13226976, while the sum is 63.

The square root of 990698697 is about 31475.3665109717. The cubic root of 990698697 is about 996.8899029909.

The spelling of 990698697 in words is "nine hundred ninety million, six hundred ninety-eight thousand, six hundred ninety-seven".