247871489 has 4 divisors (see below), whose sum is σ = 250065156. Its totient is φ = 245677824.

The previous prime is 247871431. The next prime is 247871537. The reversal of 247871489 is 984178742.

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

It can be written as a sum of positive squares in 2 ways, for example, as 66699889 + 181171600 = 8167^2 + 13460^2 .

It is a cyclic number.

It is not a de Polignac number, because 247871489 - 2¹⁶ = 247805953 is a prime.

It is a super-2 number, since 2×247871489² = 122880550118154242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247871419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1096664 + ... + 1096889.

It is an arithmetic number, because the mean of its divisors is an integer number (62516289).

Almost surely, 2^247871489 is an apocalyptic number.

It is an amenable number.

247871489 is a deficient number, since it is larger than the sum of its proper divisors (2193667).

247871489 is a wasteful number, since it uses less digits than its factorization.

247871489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2193666.

The product of its digits is 903168, while the sum is 50.

The square root of 247871489 is about 15743.9349909735. The cubic root of 247871489 is about 628.1675896932.

The spelling of 247871489 in words is "two hundred forty-seven million, eight hundred seventy-one thousand, four hundred eighty-nine".