31343261 has 2 divisors, whose sum is σ = 31343262. Its totient is φ = 31343260.

The previous prime is 31343251. The next prime is 31343269. The reversal of 31343261 is 16234313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24552025 + 6791236 = 4955^2 + 2606^2 .

It is an emirp because it is prime and its reverse (16234313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31343261 - 2⁶ = 31343197 is a prime.

It is a super-2 number, since 2×31343261² = 1964800020228242, which contains 22 as substring.

It is a nialpdrome in base 13.

It is a zygodrome in base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31343269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15671630 + 15671631.

It is an arithmetic number, because the mean of its divisors is an integer number (15671631).

Almost surely, 2^31343261 is an apocalyptic number.

It is an amenable number.

31343261 is a deficient number, since it is larger than the sum of its proper divisors (1).

31343261 is an equidigital number, since it uses as much as digits as its factorization.

31343261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 23.

The square root of 31343261 is about 5598.5052469387. The cubic root of 31343261 is about 315.2932886120.

Adding to 31343261 its reverse (16234313), we get a palindrome (47577574).

The spelling of 31343261 in words is "thirty-one million, three hundred forty-three thousand, two hundred sixty-one".