1853434981 has 4 divisors (see below), whose sum is σ = 1864148652. Its totient is φ = 1842721312.

The previous prime is 1853434949. The next prime is 1853434987. The reversal of 1853434981 is 1894343581.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1743814081 + 109620900 = 41759^2 + 10470^2 .

It is a cyclic number.

It is not a de Polignac number, because 1853434981 - 2⁵ = 1853434949 is a prime.

It is a super-2 number, since 2×1853434981² = 6870442457588940722, 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 (1853434987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5356576 + ... + 5356921.

It is an arithmetic number, because the mean of its divisors is an integer number (466037163).

Almost surely, 2^1853434981 is an apocalyptic number.

It is an amenable number.

1853434981 is a deficient number, since it is larger than the sum of its proper divisors (10713671).

1853434981 is a wasteful number, since it uses less digits than its factorization.

1853434981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10713670.

The product of its digits is 414720, while the sum is 46.

The square root of 1853434981 is about 43051.5386600758. The cubic root of 1853434981 is about 1228.3603377336.

The spelling of 1853434981 in words is "one billion, eight hundred fifty-three million, four hundred thirty-four thousand, nine hundred eighty-one".