191009192001 has 4 divisors (see below), whose sum is σ = 254678922672. Its totient is φ = 127339461332.

The previous prime is 191009191999. The next prime is 191009192029. The reversal of 191009192001 is 100291900191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 191009192001 - 2¹ = 191009191999 is a prime.

It is a super-2 number, since 2×191009192001² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (191009192041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31834865331 + ... + 31834865336.

It is an arithmetic number, because the mean of its divisors is an integer number (63669730668).

Almost surely, 2^191009192001 is an apocalyptic number.

It is an amenable number.

191009192001 is a deficient number, since it is larger than the sum of its proper divisors (63669730671).

191009192001 is an equidigital number, since it uses as much as digits as its factorization.

191009192001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63669730670.

The product of its (nonzero) digits is 1458, while the sum is 33.

The spelling of 191009192001 in words is "one hundred ninety-one billion, nine million, one hundred ninety-two thousand, one".