1881190881 has 12 divisors (see below), whose sum is σ = 2721064320. Its totient is φ = 1252378680.

The previous prime is 1881190877. The next prime is 1881190901. The reversal of 1881190881 is 1880911881.

It is not a de Polignac number, because 1881190881 - 2² = 1881190877 is a prime.

It is a super-2 number, since 2×1881190881² = 7077758261515112322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1881190481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138885 + ... + 151826.

It is an arithmetic number, because the mean of its divisors is an integer number (226755360).

Almost surely, 2^1881190881 is an apocalyptic number.

It is an amenable number.

1881190881 is a deficient number, since it is larger than the sum of its proper divisors (839873439).

1881190881 is a wasteful number, since it uses less digits than its factorization.

1881190881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291436 (or 291433 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 45.

The square root of 1881190881 is about 43372.6974143873. The cubic root of 1881190881 is about 1234.4617040296.

The spelling of 1881190881 in words is "one billion, eight hundred eighty-one million, one hundred ninety thousand, eight hundred eighty-one".