2261531 has 2 divisors, whose sum is σ = 2261532. Its totient is φ = 2261530.

The previous prime is 2261509. The next prime is 2261549. The reversal of 2261531 is 1351622.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2261531 - 2¹⁴ = 2245147 is a prime.

It is a super-2 number, since 2×2261531² = 10229044927922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2261591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1130765 + 1130766.

It is an arithmetic number, because the mean of its divisors is an integer number (1130766).

2^2261531 is an apocalyptic number.

2261531 is a deficient number, since it is larger than the sum of its proper divisors (1).

2261531 is an equidigital number, since it uses as much as digits as its factorization.

2261531 is an evil number, because the sum of its binary digits is even.

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

The square root of 2261531 is about 1503.8387546542. The cubic root of 2261531 is about 131.2605385340.

Subtracting from 2261531 its reverse (1351622), we obtain a palindrome (909909).

The spelling of 2261531 in words is "two million, two hundred sixty-one thousand, five hundred thirty-one".