247390244891 has 4 divisors (see below), whose sum is σ = 247402388112. Its totient is φ = 247378101672.

The previous prime is 247390244861. The next prime is 247390244921. The reversal of 247390244891 is 198442093742.

247390244891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198442093742 = 2 ⋅99221046871.

It is an interprime number because it is at equal distance from previous prime (247390244861) and next prime (247390244921).

It is a cyclic number.

It is not a de Polignac number, because 247390244891 - 2¹⁴ = 247390228507 is a prime.

It is a super-2 number, since 2×247390244891² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247390244861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6041000 + ... + 6081813.

It is an arithmetic number, because the mean of its divisors is an integer number (61850597028).

Almost surely, 2^247390244891 is an apocalyptic number.

247390244891 is a deficient number, since it is larger than the sum of its proper divisors (12143221).

247390244891 is a wasteful number, since it uses less digits than its factorization.

247390244891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12143220.

The product of its (nonzero) digits is 3483648, while the sum is 53.

The spelling of 247390244891 in words is "two hundred forty-seven billion, three hundred ninety million, two hundred forty-four thousand, eight hundred ninety-one".