72194407291 has 4 divisors (see below), whose sum is σ = 72235592392. Its totient is φ = 72153222192.

The previous prime is 72194407283. The next prime is 72194407321. The reversal of 72194407291 is 19270449127.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72194407291 - 2³ = 72194407283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72194407891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20589921 + ... + 20593426.

It is an arithmetic number, because the mean of its divisors is an integer number (18058898098).

Almost surely, 2^72194407291 is an apocalyptic number.

72194407291 is a deficient number, since it is larger than the sum of its proper divisors (41185101).

72194407291 is a wasteful number, since it uses less digits than its factorization.

72194407291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41185100.

The product of its (nonzero) digits is 254016, while the sum is 46.

The spelling of 72194407291 in words is "seventy-two billion, one hundred ninety-four million, four hundred seven thousand, two hundred ninety-one".