5121251261 has 12 divisors (see below), whose sum is σ = 5919424032. Its totient is φ = 4340275104.

The previous prime is 5121251249. The next prime is 5121251287. The reversal of 5121251261 is 1621521215.

It is not a de Polignac number, because 5121251261 - 2²⁶ = 5054142397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5121251261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5121251761) 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, 9266 + ... + 101628.

It is an arithmetic number, because the mean of its divisors is an integer number (493285336).

Almost surely, 2^5121251261 is an apocalyptic number.

It is an amenable number.

5121251261 is a deficient number, since it is larger than the sum of its proper divisors (798172771).

5121251261 is an frugal number, since it uses more digits than its factorization.

5121251261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92548 (or 92459 counting only the distinct ones).

The product of its digits is 1200, while the sum is 26.

The square root of 5121251261 is about 71562.9181979047. The cubic root of 5121251261 is about 1723.6881447615.

Adding to 5121251261 its reverse (1621521215), we get a palindrome (6742772476).

The spelling of 5121251261 in words is "five billion, one hundred twenty-one million, two hundred fifty-one thousand, two hundred sixty-one".