1881221650 has 96 divisors (see below), whose sum is σ = 4376291328. Its totient is φ = 584500800.

The previous prime is 1881221647. The next prime is 1881221651. The reversal of 1881221650 is 561221881.

It is not an unprimeable number, because it can be changed into a prime (1881221651) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1704999 + ... + 1706101.

It is an arithmetic number, because the mean of its divisors is an integer number (45586368).

Almost surely, 2^1881221650 is an apocalyptic number.

1881221650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1881221650 is an abundant number, since it is smaller than the sum of its proper divisors (2495069678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1881221650 is a wasteful number, since it uses less digits than its factorization.

1881221650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1576 (or 1571 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 34.

The square root of 1881221650 is about 43373.0521176456. The cubic root of 1881221650 is about 1234.4684343311.

The spelling of 1881221650 in words is "one billion, eight hundred eighty-one million, two hundred twenty-one thousand, six hundred fifty".