201691379 has 2 divisors, whose sum is σ = 201691380. Its totient is φ = 201691378.

The previous prime is 201691361. The next prime is 201691409. The reversal of 201691379 is 973196102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201691379 - 2⁸ = 201691123 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (201691579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100845689 + 100845690.

It is an arithmetic number, because the mean of its divisors is an integer number (100845690).

Almost surely, 2^201691379 is an apocalyptic number.

201691379 is a deficient number, since it is larger than the sum of its proper divisors (1).

201691379 is an equidigital number, since it uses as much as digits as its factorization.

201691379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 201691379 is about 14201.8090044895. The cubic root of 201691379 is about 586.4474629080.

The spelling of 201691379 in words is "two hundred one million, six hundred ninety-one thousand, three hundred seventy-nine".