191540077 has 2 divisors, whose sum is σ = 191540078. Its totient is φ = 191540076.

The previous prime is 191540051. The next prime is 191540093. The reversal of 191540077 is 770045191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122633476 + 68906601 = 11074^2 + 8301^2 .

It is a cyclic number.

It is not a de Polignac number, because 191540077 - 2¹¹ = 191538029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191544077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95770038 + 95770039.

It is an arithmetic number, because the mean of its divisors is an integer number (95770039).

Almost surely, 2^191540077 is an apocalyptic number.

It is an amenable number.

191540077 is a deficient number, since it is larger than the sum of its proper divisors (1).

191540077 is an equidigital number, since it uses as much as digits as its factorization.

191540077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8820, while the sum is 34.

The square root of 191540077 is about 13839.8004682149. The cubic root of 191540077 is about 576.4388183284.

The spelling of 191540077 in words is "one hundred ninety-one million, five hundred forty thousand, seventy-seven".