201291397 has 2 divisors, whose sum is σ = 201291398. Its totient is φ = 201291396.

The previous prime is 201291347. The next prime is 201291437. The reversal of 201291397 is 793192102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111534721 + 89756676 = 10561^2 + 9474^2 .

It is a cyclic number.

It is not a de Polignac number, because 201291397 - 2⁷ = 201291269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201291347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100645698 + 100645699.

It is an arithmetic number, because the mean of its divisors is an integer number (100645699).

Almost surely, 2^201291397 is an apocalyptic number.

It is an amenable number.

201291397 is a deficient number, since it is larger than the sum of its proper divisors (1).

201291397 is an equidigital number, since it uses as much as digits as its factorization.

201291397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 201291397 is about 14187.7199366212. The cubic root of 201291397 is about 586.0595374516.

The spelling of 201291397 in words is "two hundred one million, two hundred ninety-one thousand, three hundred ninety-seven".