1002181881 has 4 divisors (see below), whose sum is σ = 1336242512. Its totient is φ = 668121252.

The previous prime is 1002181879. The next prime is 1002181903. The reversal of 1002181881 is 1881812001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1002181881 - 2¹ = 1002181879 is a prime.

It is a super-2 number, since 2×1002181881² = 2008737045209396322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1002181801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167030311 + ... + 167030316.

It is an arithmetic number, because the mean of its divisors is an integer number (334060628).

Almost surely, 2^1002181881 is an apocalyptic number.

It is an amenable number.

1002181881 is a deficient number, since it is larger than the sum of its proper divisors (334060631).

1002181881 is an equidigital number, since it uses as much as digits as its factorization.

1002181881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334060630.

The product of its (nonzero) digits is 1024, while the sum is 30.

The square root of 1002181881 is about 31657.2563719600. The cubic root of 1002181881 is about 1000.7267653508.

Adding to 1002181881 its reverse (1881812001), we get a palindrome (2883993882).

The spelling of 1002181881 in words is "one billion, two million, one hundred eighty-one thousand, eight hundred eighty-one".