191649229 has 2 divisors, whose sum is σ = 191649230. Its totient is φ = 191649228.

The previous prime is 191649203. The next prime is 191649239. The reversal of 191649229 is 922946191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189612900 + 2036329 = 13770^2 + 1427^2 .

It is a cyclic number.

It is not a de Polignac number, because 191649229 - 2²³ = 183260621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191649239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95824614 + 95824615.

It is an arithmetic number, because the mean of its divisors is an integer number (95824615).

Almost surely, 2^191649229 is an apocalyptic number.

It is an amenable number.

191649229 is a deficient number, since it is larger than the sum of its proper divisors (1).

191649229 is an equidigital number, since it uses as much as digits as its factorization.

191649229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 43.

The square root of 191649229 is about 13843.7433160255. The cubic root of 191649229 is about 576.5482949852.

The spelling of 191649229 in words is "one hundred ninety-one million, six hundred forty-nine thousand, two hundred twenty-nine".