31745261 has 2 divisors, whose sum is σ = 31745262. Its totient is φ = 31745260.

The previous prime is 31745213. The next prime is 31745279. The reversal of 31745261 is 16254713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21215236 + 10530025 = 4606^2 + 3245^2 .

It is a cyclic number.

It is not a de Polignac number, because 31745261 - 2¹⁸ = 31483117 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31745201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15872630 + 15872631.

It is an arithmetic number, because the mean of its divisors is an integer number (15872631).

Almost surely, 2^31745261 is an apocalyptic number.

It is an amenable number.

31745261 is a deficient number, since it is larger than the sum of its proper divisors (1).

31745261 is an equidigital number, since it uses as much as digits as its factorization.

31745261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 29.

The square root of 31745261 is about 5634.2933008497. The cubic root of 31745261 is about 316.6355213444.

Adding to 31745261 its reverse (16254713), we get a palindrome (47999974).

The spelling of 31745261 in words is "thirty-one million, seven hundred forty-five thousand, two hundred sixty-one".