31525261 has 2 divisors, whose sum is σ = 31525262. Its totient is φ = 31525260.

The previous prime is 31525243. The next prime is 31525267. The reversal of 31525261 is 16252513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16362025 + 15163236 = 4045^2 + 3894^2 .

It is a cyclic number.

It is not a de Polignac number, because 31525261 - 2⁵ = 31525229 is a prime.

It is a super-2 number, since 2×31525261² = 1987684162236242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31525267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15762630 + 15762631.

It is an arithmetic number, because the mean of its divisors is an integer number (15762631).

Almost surely, 2^31525261 is an apocalyptic number.

It is an amenable number.

31525261 is a deficient number, since it is larger than the sum of its proper divisors (1).

31525261 is an equidigital number, since it uses as much as digits as its factorization.

31525261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 25.

The square root of 31525261 is about 5614.7360579105. The cubic root of 31525261 is about 315.9023793152.

Adding to 31525261 its reverse (16252513), we get a palindrome (47777774).

The spelling of 31525261 in words is "thirty-one million, five hundred twenty-five thousand, two hundred sixty-one".