201678791 has 2 divisors, whose sum is σ = 201678792. Its totient is φ = 201678790.

The previous prime is 201678773. The next prime is 201678793. The reversal of 201678791 is 197876102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201678791 - 2¹⁸ = 201416647 is a prime.

Together with 201678793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201678793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100839395 + 100839396.

It is an arithmetic number, because the mean of its divisors is an integer number (100839396).

Almost surely, 2^201678791 is an apocalyptic number.

201678791 is a deficient number, since it is larger than the sum of its proper divisors (1).

201678791 is an equidigital number, since it uses as much as digits as its factorization.

201678791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 41.

The square root of 201678791 is about 14201.3658145968. The cubic root of 201678791 is about 586.4352621647.

The spelling of 201678791 in words is "two hundred one million, six hundred seventy-eight thousand, seven hundred ninety-one".