248491881 has 20 divisors (see below), whose sum is σ = 404951184. Its totient is φ = 150600600.

The previous prime is 248491871. The next prime is 248491909. The reversal of 248491881 is 188194842.

248491881 is a `hidden beast` number, since 2 + 484 + 91 + 8 + 81 = 666.

It is not a de Polignac number, because 248491881 - 2⁵ = 248491849 is a prime.

It is a super-2 number, since 2×248491881² = 123496429845836322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (248491801) 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 19 ways as a sum of consecutive naturals, for example, 138555 + ... + 140336.

Almost surely, 2^248491881 is an apocalyptic number.

It is an amenable number.

248491881 is a deficient number, since it is larger than the sum of its proper divisors (156459303).

248491881 is a wasteful number, since it uses less digits than its factorization.

248491881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278914 (or 278905 counting only the distinct ones).

The product of its digits is 147456, while the sum is 45.

The square root of 248491881 is about 15763.6252492883. The cubic root of 248491881 is about 628.6912285997.

The spelling of 248491881 in words is "two hundred forty-eight million, four hundred ninety-one thousand, eight hundred eighty-one".