247875393795481 has 3 divisors (see below), whose sum is σ = 247875409539541. Its totient is φ = 247875378051422.

The previous prime is 247875393795473. The next prime is 247875393795487. The reversal of 247875393795481 is 184597393578742.

The square root of 247875393795481 is 15744059.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 247875393795481 - 2³ = 247875393795473 is a prime.

It is a super-2 number, since 2×247875393795481² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 247875393795395 and 247875393795404.

It is not an unprimeable number, because it can be changed into a prime (247875393795487) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7872030 + ... + 23616088.

Almost surely, 2^{247875393795481} is an apocalyptic number.

247875393795481 is the 15744059-th square number.

247875393795481 is the 7872030-th centered octagonal number.

It is an amenable number.

247875393795481 is a deficient number, since it is larger than the sum of its proper divisors (15744060).

247875393795481 is an frugal number, since it uses more digits than its factorization.

247875393795481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31488118 (or 15744059 counting only the distinct ones).

The product of its digits is 12802406400, while the sum is 82.

The spelling of 247875393795481 in words is "two hundred forty-seven trillion, eight hundred seventy-five billion, three hundred ninety-three million, seven hundred ninety-five thousand, four hundred eighty-one".