247842491 has 8 divisors (see below), whose sum is σ = 268677024. Its totient is φ = 227260800.

The previous prime is 247842481. The next prime is 247842493. The reversal of 247842491 is 194248742.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 247842491 - 2²² = 243648187 is a prime.

It is a super-2 number, since 2×247842491² = 122851800690170162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247842493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61166 + ... + 65091.

It is an arithmetic number, because the mean of its divisors is an integer number (33584628).

Almost surely, 2^247842491 is an apocalyptic number.

247842491 is a deficient number, since it is larger than the sum of its proper divisors (20834533).

247842491 is a wasteful number, since it uses less digits than its factorization.

247842491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126421.

The product of its digits is 129024, while the sum is 41.

The square root of 247842491 is about 15743.0140379789. The cubic root of 247842491 is about 628.1430927059.

The spelling of 247842491 in words is "two hundred forty-seven million, eight hundred forty-two thousand, four hundred ninety-one".