2531261 has 2 divisors, whose sum is σ = 2531262. Its totient is φ = 2531260.

The previous prime is 2531233. The next prime is 2531267. The reversal of 2531261 is 1621352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1907161 + 624100 = 1381^2 + 790^2 .

It is a cyclic number.

It is not a de Polignac number, because 2531261 - 2⁶ = 2531197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2531267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1265630 + 1265631.

It is an arithmetic number, because the mean of its divisors is an integer number (1265631).

2^2531261 is an apocalyptic number.

It is an amenable number.

2531261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2531261 is an equidigital number, since it uses as much as digits as its factorization.

2531261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 20.

The square root of 2531261 is about 1590.9937146325. The cubic root of 2531261 is about 136.2842418777.

Adding to 2531261 its sum of digits (20), we get a square (2531281 = 1591²).

Subtracting from 2531261 its reverse (1621352), we obtain a palindrome (909909).

The spelling of 2531261 in words is "two million, five hundred thirty-one thousand, two hundred sixty-one".