1694680861 has 2 divisors, whose sum is σ = 1694680862. Its totient is φ = 1694680860.

The previous prime is 1694680849. The next prime is 1694680909. The reversal of 1694680861 is 1680864961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1671583225 + 23097636 = 40885^2 + 4806^2 .

It is a cyclic number.

It is not a de Polignac number, because 1694680861 - 2⁵ = 1694680829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1694680261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 847340430 + 847340431.

It is an arithmetic number, because the mean of its divisors is an integer number (847340431).

Almost surely, 2^1694680861 is an apocalyptic number.

It is an amenable number.

1694680861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1694680861 is an equidigital number, since it uses as much as digits as its factorization.

1694680861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 497664, while the sum is 49.

The square root of 1694680861 is about 41166.5016852295. The cubic root of 1694680861 is about 1192.2371261224.

The spelling of 1694680861 in words is "one billion, six hundred ninety-four million, six hundred eighty thousand, eight hundred sixty-one".