1983801901 has 4 divisors (see below), whose sum is σ = 2006091900. Its totient is φ = 1961511904.

The previous prime is 1983801881. The next prime is 1983801931. The reversal of 1983801901 is 1091083891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1091083891 = 599 ⋅1821509.

It can be written as a sum of positive squares in 2 ways, for example, as 261468900 + 1722333001 = 16170^2 + 41501^2 .

It is a cyclic number.

It is not a de Polignac number, because 1983801901 - 2⁹ = 1983801389 is a prime.

It is a super-2 number, since 2×1983801901² = 7870939964822427602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1983801931) 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, 11144866 + ... + 11145043.

It is an arithmetic number, because the mean of its divisors is an integer number (501522975).

Almost surely, 2^1983801901 is an apocalyptic number.

It is an amenable number.

1983801901 is a deficient number, since it is larger than the sum of its proper divisors (22289999).

1983801901 is an equidigital number, since it uses as much as digits as its factorization.

1983801901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22289998.

The product of its (nonzero) digits is 15552, while the sum is 40.

The square root of 1983801901 is about 44539.8911202082. The cubic root of 1983801901 is about 1256.5104380346.

The spelling of 1983801901 in words is "one billion, nine hundred eighty-three million, eight hundred one thousand, nine hundred one".