5261243121 has 12 divisors (see below), whose sum is σ = 7761267072. Its totient is φ = 3432867576.

The previous prime is 5261243069. The next prime is 5261243129. The reversal of 5261243121 is 1213421625.

5261243121 is a `hidden beast` number, since 5 + 2 + 612 + 43 + 1 + 2 + 1 = 666.

It is not a de Polignac number, because 5261243121 - 2²² = 5257048817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5261243129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6218541 + ... + 6219386.

It is an arithmetic number, because the mean of its divisors is an integer number (646772256).

Almost surely, 2^5261243121 is an apocalyptic number.

It is an amenable number.

5261243121 is a deficient number, since it is larger than the sum of its proper divisors (2500023951).

5261243121 is a wasteful number, since it uses less digits than its factorization.

5261243121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12437980 (or 12437977 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 5261243121 is about 72534.4271432538. The cubic root of 5261243121 is about 1739.2531168275.

Adding to 5261243121 its reverse (1213421625), we get a palindrome (6474664746).

The spelling of 5261243121 in words is "five billion, two hundred sixty-one million, two hundred forty-three thousand, one hundred twenty-one".