212601691 has 2 divisors, whose sum is σ = 212601692. Its totient is φ = 212601690.

The previous prime is 212601661. The next prime is 212601713. The reversal of 212601691 is 196106212.

212601691 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 cyclic number.

It is not a de Polignac number, because 212601691 - 2⁷ = 212601563 is a prime.

It is not a weakly prime, because it can be changed into another prime (212601601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106300845 + 106300846.

It is an arithmetic number, because the mean of its divisors is an integer number (106300846).

Almost surely, 2^212601691 is an apocalyptic number.

212601691 is a deficient number, since it is larger than the sum of its proper divisors (1).

212601691 is an equidigital number, since it uses as much as digits as its factorization.

212601691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 212601691 is about 14580.8672924487. The cubic root of 212601691 is about 596.8367701947.

The spelling of 212601691 in words is "two hundred twelve million, six hundred one thousand, six hundred ninety-one".