1801138825 has 12 divisors (see below), whose sum is σ = 2234036700. Its totient is φ = 1440508160.

The previous prime is 1801138769. The next prime is 1801138847. The reversal of 1801138825 is 5288311081.

It can be written as a sum of positive squares in 6 ways, for example, as 386476281 + 1414662544 = 19659^2 + 37612^2 .

It is not a de Polignac number, because 1801138825 - 2¹³ = 1801130633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108477 + ... + 123973.

It is an arithmetic number, because the mean of its divisors is an integer number (186169725).

Almost surely, 2^1801138825 is an apocalyptic number.

It is an amenable number.

1801138825 is a deficient number, since it is larger than the sum of its proper divisors (432897875).

1801138825 is a wasteful number, since it uses less digits than its factorization.

1801138825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20156 (or 20151 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 37.

The square root of 1801138825 is about 42439.8259303688. The cubic root of 1801138825 is about 1216.6968844270.

The spelling of 1801138825 in words is "one billion, eight hundred one million, one hundred thirty-eight thousand, eight hundred twenty-five".