3694679981 has 2 divisors, whose sum is σ = 3694679982. Its totient is φ = 3694679980.

The previous prime is 3694679899. The next prime is 3694680001. The reversal of 3694679981 is 1899764963.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3539179081 + 155500900 = 59491^2 + 12470^2 .

It is a cyclic number.

It is not a de Polignac number, because 3694679981 - 2¹⁰ = 3694678957 is a prime.

It is a super-2 number, since 2×3694679981² = 27301320324004320722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3694679381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1847339990 + 1847339991.

It is an arithmetic number, because the mean of its divisors is an integer number (1847339991).

Almost surely, 2^3694679981 is an apocalyptic number.

It is an amenable number.

3694679981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3694679981 is an equidigital number, since it uses as much as digits as its factorization.

3694679981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17635968, while the sum is 62.

The square root of 3694679981 is about 60783.8792855474. The cubic root of 3694679981 is about 1545.9387236973.

The spelling of 3694679981 in words is "three billion, six hundred ninety-four million, six hundred seventy-nine thousand, nine hundred eighty-one".