699648091 has 4 divisors (see below), whose sum is σ = 700272232. Its totient is φ = 699023952.

The previous prime is 699648043. The next prime is 699648121. The reversal of 699648091 is 190846996.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 699648091 - 2⁹ = 699647579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (699648031) 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, 310386 + ... + 312631.

It is an arithmetic number, because the mean of its divisors is an integer number (175068058).

Almost surely, 2^699648091 is an apocalyptic number.

699648091 is a deficient number, since it is larger than the sum of its proper divisors (624141).

699648091 is a wasteful number, since it uses less digits than its factorization.

699648091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624140.

The product of its (nonzero) digits is 839808, while the sum is 52.

The square root of 699648091 is about 26450.8618196081. The cubic root of 699648091 is about 887.7551856545.

The spelling of 699648091 in words is "six hundred ninety-nine million, six hundred forty-eight thousand, ninety-one".