699935981 has 4 divisors (see below), whose sum is σ = 702992700. Its totient is φ = 696879264.

The previous prime is 699935941. The next prime is 699936007. The reversal of 699935981 is 189539996.

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

It can be written as a sum of positive squares in 2 ways, for example, as 551827081 + 148108900 = 23491^2 + 12170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-699935981 is a prime.

It is a super-2 number, since 2×699935981² = 979820754996864722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 699935981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (699935941) 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, 1528016 + ... + 1528473.

It is an arithmetic number, because the mean of its divisors is an integer number (175748175).

Almost surely, 2^699935981 is an apocalyptic number.

It is an amenable number.

699935981 is a deficient number, since it is larger than the sum of its proper divisors (3056719).

699935981 is a wasteful number, since it uses less digits than its factorization.

699935981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3056718.

The product of its digits is 4723920, while the sum is 59.

The square root of 699935981 is about 26456.3032376029. The cubic root of 699935981 is about 887.8769329525.

The spelling of 699935981 in words is "six hundred ninety-nine million, nine hundred thirty-five thousand, nine hundred eighty-one".