191349401 has 2 divisors, whose sum is σ = 191349402. Its totient is φ = 191349400.

The previous prime is 191349349. The next prime is 191349409. The reversal of 191349401 is 104943191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185613376 + 5736025 = 13624^2 + 2395^2 .

It is an emirp because it is prime and its reverse (104943191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191349401 - 2¹⁴ = 191333017 is a prime.

It is a super-2 number, since 2×191349401² = 73229186526117602, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (191349409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95674700 + 95674701.

It is an arithmetic number, because the mean of its divisors is an integer number (95674701).

Almost surely, 2^191349401 is an apocalyptic number.

It is an amenable number.

191349401 is a deficient number, since it is larger than the sum of its proper divisors (1).

191349401 is an equidigital number, since it uses as much as digits as its factorization.

191349401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 191349401 is about 13832.9100698298. The cubic root of 191349401 is about 576.2474753600.

The spelling of 191349401 in words is "one hundred ninety-one million, three hundred forty-nine thousand, four hundred one".