1881881247 has 4 divisors (see below), whose sum is σ = 2509175000. Its totient is φ = 1254587496.

The previous prime is 1881881233. The next prime is 1881881251. The reversal of 1881881247 is 7421881881.

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

It is not a de Polignac number, because 1881881247 - 2⁸ = 1881880991 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1881881196 and 1881881205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881881227) 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 3 ways as a sum of consecutive naturals, for example, 313646872 + ... + 313646877.

It is an arithmetic number, because the mean of its divisors is an integer number (627293750).

Almost surely, 2^1881881247 is an apocalyptic number.

1881881247 is a deficient number, since it is larger than the sum of its proper divisors (627293753).

1881881247 is an equidigital number, since it uses as much as digits as its factorization.

1881881247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627293752.

The product of its digits is 229376, while the sum is 48.

The square root of 1881881247 is about 43380.6552163519. The cubic root of 1881881247 is about 1234.6126945834.

The spelling of 1881881247 in words is "one billion, eight hundred eighty-one million, eight hundred eighty-one thousand, two hundred forty-seven".