472047221491 has 4 divisors (see below), whose sum is σ = 472761363184. Its totient is φ = 471333079800.

The previous prime is 472047221473. The next prime is 472047221521. The reversal of 472047221491 is 194122740274.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-472047221491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (472047224491) 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, 357069855 + ... + 357071176.

It is an arithmetic number, because the mean of its divisors is an integer number (118190340796).

Almost surely, 2^472047221491 is an apocalyptic number.

472047221491 is a deficient number, since it is larger than the sum of its proper divisors (714141693).

472047221491 is an equidigital number, since it uses as much as digits as its factorization.

472047221491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714141692.

The product of its (nonzero) digits is 225792, while the sum is 43.

The spelling of 472047221491 in words is "four hundred seventy-two billion, forty-seven million, two hundred twenty-one thousand, four hundred ninety-one".