191124904781 has 2 divisors, whose sum is σ = 191124904782. Its totient is φ = 191124904780.

The previous prime is 191124904693. The next prime is 191124904799. The reversal of 191124904781 is 187409421191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189515691556 + 1609213225 = 435334^2 + 40115^2 .

It is a cyclic number.

It is not a de Polignac number, because 191124904781 - 2¹⁸ = 191124642637 is a prime.

It is a super-2 number, since 2×191124904781² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191124904981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95562452390 + 95562452391.

It is an arithmetic number, because the mean of its divisors is an integer number (95562452391).

Almost surely, 2^191124904781 is an apocalyptic number.

It is an amenable number.

191124904781 is a deficient number, since it is larger than the sum of its proper divisors (1).

191124904781 is an equidigital number, since it uses as much as digits as its factorization.

191124904781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 47.

The spelling of 191124904781 in words is "one hundred ninety-one billion, one hundred twenty-four million, nine hundred four thousand, seven hundred eighty-one".