1993850881 has 4 divisors (see below), whose sum is σ = 2175110064. Its totient is φ = 1812591700.

The previous prime is 1993850867. The next prime is 1993850917. The reversal of 1993850881 is 1880583991.

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 a cyclic number.

It is not a de Polignac number, because 1993850881 - 2¹¹ = 1993848833 is a prime.

It is a super-2 number, since 2×1993850881² = 7950882671328952322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1993850081) 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, 90629575 + ... + 90629596.

It is an arithmetic number, because the mean of its divisors is an integer number (543777516).

Almost surely, 2^1993850881 is an apocalyptic number.

1993850881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1993850881 is a deficient number, since it is larger than the sum of its proper divisors (181259183).

1993850881 is a wasteful number, since it uses less digits than its factorization.

1993850881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181259182.

The product of its (nonzero) digits is 622080, while the sum is 52.

The square root of 1993850881 is about 44652.5573847680. The cubic root of 1993850881 is about 1258.6284902268.

The spelling of 1993850881 in words is "one billion, nine hundred ninety-three million, eight hundred fifty thousand, eight hundred eighty-one".