191129004977 has 2 divisors, whose sum is σ = 191129004978. Its totient is φ = 191129004976.

The previous prime is 191129004887. The next prime is 191129005021. The reversal of 191129004977 is 779400921191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175895521201 + 15233483776 = 419399^2 + 123424^2 .

It is an emirp because it is prime and its reverse (779400921191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191129004977 - 2¹⁰ = 191129003953 is a prime.

It is not a weakly prime, because it can be changed into another prime (191129001977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95564502488 + 95564502489.

It is an arithmetic number, because the mean of its divisors is an integer number (95564502489).

Almost surely, 2^191129004977 is an apocalyptic number.

It is an amenable number.

191129004977 is a deficient number, since it is larger than the sum of its proper divisors (1).

191129004977 is an equidigital number, since it uses as much as digits as its factorization.

191129004977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 285768, while the sum is 50.

The spelling of 191129004977 in words is "one hundred ninety-one billion, one hundred twenty-nine million, four thousand, nine hundred seventy-seven".