1881121490 has 8 divisors (see below), whose sum is σ = 3386018700. Its totient is φ = 752448592.

The previous prime is 1881121441. The next prime is 1881121537. The reversal of 1881121490 is 941211881.

It can be written as a sum of positive squares in 2 ways, for example, as 1626750889 + 254370601 = 40333^2 + 15949^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 1881121490.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94056065 + ... + 94056084.

Almost surely, 2^1881121490 is an apocalyptic number.

1881121490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1881121490 is a deficient number, since it is larger than the sum of its proper divisors (1504897210).

1881121490 is a wasteful number, since it uses less digits than its factorization.

1881121490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188112156.

The product of its (nonzero) digits is 4608, while the sum is 35.

The square root of 1881121490 is about 43371.8974682916. The cubic root of 1881121490 is about 1234.4465254201.

The spelling of 1881121490 in words is "one billion, eight hundred eighty-one million, one hundred twenty-one thousand, four hundred ninety".