191000920001 has 2 divisors, whose sum is σ = 191000920002. Its totient is φ = 191000920000.

The previous prime is 191000919971. The next prime is 191000920039. The reversal of 191000920001 is 100029000191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99871800625 + 91129119376 = 316025^2 + 301876^2 .

It is a cyclic number.

It is not a de Polignac number, because 191000920001 - 2¹⁴ = 191000903617 is a prime.

It is a super-3 number, since 3×191000920001³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (191000920081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95500460000 + 95500460001.

It is an arithmetic number, because the mean of its divisors is an integer number (95500460001).

Almost surely, 2^191000920001 is an apocalyptic number.

It is an amenable number.

191000920001 is a deficient number, since it is larger than the sum of its proper divisors (1).

191000920001 is an equidigital number, since it uses as much as digits as its factorization.

191000920001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 23.

Adding to 191000920001 its reverse (100029000191), we get a palindrome (291029920192).

The spelling of 191000920001 in words is "one hundred ninety-one billion, nine hundred twenty thousand, one".