201913967691 has 12 divisors (see below), whose sum is σ = 291777278832. Its totient is φ = 134552187216.

The previous prime is 201913967683. The next prime is 201913967741. The reversal of 201913967691 is 196769319102.

201913967691 is a `hidden beast` number, since 2 + 0 + 191 + 396 + 7 + 69 + 1 = 666.

It is not a de Polignac number, because 201913967691 - 2³ = 201913967683 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (201913917691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4737991 + ... + 4780416.

It is an arithmetic number, because the mean of its divisors is an integer number (24314773236).

Almost surely, 2^201913967691 is an apocalyptic number.

201913967691 is a deficient number, since it is larger than the sum of its proper divisors (89863311141).

201913967691 is a wasteful number, since it uses less digits than its factorization.

201913967691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9520770 (or 9520767 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 54.

The spelling of 201913967691 in words is "two hundred one billion, nine hundred thirteen million, nine hundred sixty-seven thousand, six hundred ninety-one".