2481135721 has 3 divisors (see below), whose sum is σ = 2481185533. Its totient is φ = 2481085910.

The previous prime is 2481135697. The next prime is 2481135731. The reversal of 2481135721 is 1275311842.

The square root of 2481135721 is 49811.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 2481135721 - 2¹³ = 2481127529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2481135731) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 24906 + ... + 74716.

Almost surely, 2^2481135721 is an apocalyptic number.

2481135721 is the 49811-st square number.

2481135721 is the 24906-th centered octagonal number.

It is an amenable number.

2481135721 is a deficient number, since it is larger than the sum of its proper divisors (49812).

2481135721 is an frugal number, since it uses more digits than its factorization.

2481135721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99622 (or 49811 counting only the distinct ones).

The product of its digits is 13440, while the sum is 34.

The cubic root of 2481135721 is about 1353.7864837679.

The spelling of 2481135721 in words is "two billion, four hundred eighty-one million, one hundred thirty-five thousand, seven hundred twenty-one".