191291905432 has 16 divisors (see below), whose sum is σ = 359024322600. Its totient is φ = 95552086080.

The previous prime is 191291905423. The next prime is 191291905433. The reversal of 191291905432 is 234509192191.

It is a super-2 number, since 2×191291905432² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191291905433) 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, 11724669 + ... + 11740972.

Almost surely, 2^191291905432 is an apocalyptic number.

It is an amenable number.

191291905432 is a deficient number, since it is larger than the sum of its proper divisors (167732417168).

191291905432 is a wasteful number, since it uses less digits than its factorization.

191291905432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23466666 (or 23466662 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 46.

The spelling of 191291905432 in words is "one hundred ninety-one billion, two hundred ninety-one million, nine hundred five thousand, four hundred thirty-two".