196878691 has 2 divisors, whose sum is σ = 196878692. Its totient is φ = 196878690.

The previous prime is 196878677. The next prime is 196878697.

196878691 is nontrivially palindromic in base 10.

196878691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-196878691 is a prime.

It is a super-2 number, since 2×196878691² = 77522437939746962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (196878697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98439345 + 98439346.

It is an arithmetic number, because the mean of its divisors is an integer number (98439346).

Almost surely, 2^196878691 is an apocalyptic number.

196878691 is a deficient number, since it is larger than the sum of its proper divisors (1).

196878691 is an equidigital number, since it uses as much as digits as its factorization.

196878691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 55.

The square root of 196878691 is about 14031.3467279517. The cubic root of 196878691 is about 581.7453283254.

The spelling of 196878691 in words is "one hundred ninety-six million, eight hundred seventy-eight thousand, six hundred ninety-one".