1872545813 has 4 divisors (see below), whose sum is σ = 1872673068. Its totient is φ = 1872418560.

The previous prime is 1872545803. The next prime is 1872545821. The reversal of 1872545813 is 3185452781.

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 1857351409 + 15194404 = 43097^2 + 3898^2 .

It is a cyclic number.

It is not a de Polignac number, because 1872545813 - 2⁴ = 1872545797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1872545803) 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, 38156 + ... + 72117.

It is an arithmetic number, because the mean of its divisors is an integer number (468168267).

Almost surely, 2^1872545813 is an apocalyptic number.

It is an amenable number.

1872545813 is a deficient number, since it is larger than the sum of its proper divisors (127255).

1872545813 is a wasteful number, since it uses less digits than its factorization.

1872545813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127254.

The product of its digits is 268800, while the sum is 44.

The square root of 1872545813 is about 43272.9223995792. The cubic root of 1872545813 is about 1232.5677982089.

The spelling of 1872545813 in words is "one billion, eight hundred seventy-two million, five hundred forty-five thousand, eight hundred thirteen".