31342681 has 2 divisors, whose sum is σ = 31342682. Its totient is φ = 31342680.

The previous prime is 31342669. The next prime is 31342687. The reversal of 31342681 is 18624313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30702681 + 640000 = 5541^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 31342681 - 2¹³ = 31334489 is a prime.

It is a super-2 number, since 2×31342681² = 1964727304535522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31342687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15671340 + 15671341.

It is an arithmetic number, because the mean of its divisors is an integer number (15671341).

Almost surely, 2^31342681 is an apocalyptic number.

It is an amenable number.

31342681 is a deficient number, since it is larger than the sum of its proper divisors (1).

31342681 is an equidigital number, since it uses as much as digits as its factorization.

31342681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 28.

The square root of 31342681 is about 5598.4534471584. The cubic root of 31342681 is about 315.2913437895.

Adding to 31342681 its reverse (18624313), we get a palindrome (49966994).

It can be divided in two parts, 31342 and 681, that added together give a palindrome (32023).

The spelling of 31342681 in words is "thirty-one million, three hundred forty-two thousand, six hundred eighty-one".