191535061 has 2 divisors, whose sum is σ = 191535062. Its totient is φ = 191535060.

The previous prime is 191535041. The next prime is 191535089. The reversal of 191535061 is 160535191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143856036 + 47679025 = 11994^2 + 6905^2 .

It is a cyclic number.

It is not a de Polignac number, because 191535061 - 2⁷ = 191534933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191535041) 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, 95767530 + 95767531.

It is an arithmetic number, because the mean of its divisors is an integer number (95767531).

Almost surely, 2^191535061 is an apocalyptic number.

It is an amenable number.

191535061 is a deficient number, since it is larger than the sum of its proper divisors (1).

191535061 is an equidigital number, since it uses as much as digits as its factorization.

191535061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4050, while the sum is 31.

The square root of 191535061 is about 13839.6192505430. The cubic root of 191535061 is about 576.4337864096.

The spelling of 191535061 in words is "one hundred ninety-one million, five hundred thirty-five thousand, sixty-one".