191434250977 has 2 divisors, whose sum is σ = 191434250978. Its totient is φ = 191434250976.

The previous prime is 191434250971. The next prime is 191434251101. The reversal of 191434250977 is 779052434191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104671013841 + 86763237136 = 323529^2 + 294556^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191434250977 is a prime.

It is not a weakly prime, because it can be changed into another prime (191434250971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95717125488 + 95717125489.

It is an arithmetic number, because the mean of its divisors is an integer number (95717125489).

Almost surely, 2^191434250977 is an apocalyptic number.

It is an amenable number.

191434250977 is a deficient number, since it is larger than the sum of its proper divisors (1).

191434250977 is an equidigital number, since it uses as much as digits as its factorization.

191434250977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1905120, while the sum is 52.

The spelling of 191434250977 in words is "one hundred ninety-one billion, four hundred thirty-four million, two hundred fifty thousand, nine hundred seventy-seven".