1801238481 has 81 divisors (see below), whose sum is σ = 3165923241. Its totient is φ = 983952144.

The previous prime is 1801238479. The next prime is 1801238489. The reversal of 1801238481 is 1848321081.

The square root of 1801238481 is 42441.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1801238481 - 2¹ = 1801238479 is a prime.

It is a super-2 number, since 2×1801238481² = 6488920130870374722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1801238489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 38324200 + ... + 38324246.

Almost surely, 2^1801238481 is an apocalyptic number.

1801238481 is the 42441-st square number.

1801238481 is the 21221-st centered octagonal number.

It is an amenable number.

1801238481 is a deficient number, since it is larger than the sum of its proper divisors (1364684760).

1801238481 is an equidigital number, since it uses as much as digits as its factorization.

1801238481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The cubic root of 1801238481 is about 1216.7193237317.

Multiplying 1801238481 by its sum of digits (36), we get a square (64844585316 = 254646²).

The spelling of 1801238481 in words is "one billion, eight hundred one million, two hundred thirty-eight thousand, four hundred eighty-one".