191255101 has 2 divisors, whose sum is σ = 191255102. Its totient is φ = 191255100.

The previous prime is 191255033. The next prime is 191255107. The reversal of 191255101 is 101552191.

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., 189035001 + 2220100 = 13749^2 + 1490^2 .

It is a cyclic number.

It is not a de Polignac number, because 191255101 - 2²³ = 182866493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191255107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95627550 + 95627551.

It is an arithmetic number, because the mean of its divisors is an integer number (95627551).

Almost surely, 2^191255101 is an apocalyptic number.

It is an amenable number.

191255101 is a deficient number, since it is larger than the sum of its proper divisors (1).

191255101 is an equidigital number, since it uses as much as digits as its factorization.

191255101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 450, while the sum is 25.

The square root of 191255101 is about 13829.5011117538. The cubic root of 191255101 is about 576.1527985269.

The spelling of 191255101 in words is "one hundred ninety-one million, two hundred fifty-five thousand, one hundred one".