247478891171 has 4 divisors (see below), whose sum is σ = 249368043144. Its totient is φ = 245589739200.

The previous prime is 247478891167. The next prime is 247478891203. The reversal of 247478891171 is 171198874742.

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 247478891171 - 2² = 247478891167 is a prime.

It is a super-2 number, since 2×247478891171² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 247478891171.

It is not an unprimeable number, because it can be changed into a prime (247478890171) 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, 944575790 + ... + 944576051.

It is an arithmetic number, because the mean of its divisors is an integer number (62342010786).

Almost surely, 2^247478891171 is an apocalyptic number.

247478891171 is a deficient number, since it is larger than the sum of its proper divisors (1889151973).

247478891171 is a wasteful number, since it uses less digits than its factorization.

247478891171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889151972.

The product of its digits is 6322176, while the sum is 59.

The spelling of 247478891171 in words is "two hundred forty-seven billion, four hundred seventy-eight million, eight hundred ninety-one thousand, one hundred seventy-one".