31340423 has 2 divisors, whose sum is σ = 31340424. Its totient is φ = 31340422.

The previous prime is 31340417. The next prime is 31340447. The reversal of 31340423 is 32404313.

It is a weak prime.

It is an emirp because it is prime and its reverse (32404313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31340423 - 2⁸ = 31340167 is a prime.

It is a super-2 number, since 2×31340423² = 1964444227637858, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 31340395 and 31340404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31340453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15670211 + 15670212.

It is an arithmetic number, because the mean of its divisors is an integer number (15670212).

Almost surely, 2^31340423 is an apocalyptic number.

31340423 is a deficient number, since it is larger than the sum of its proper divisors (1).

31340423 is an equidigital number, since it uses as much as digits as its factorization.

31340423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 31340423 is about 5598.2517806901. The cubic root of 31340423 is about 315.2837721659.

Adding to 31340423 its reverse (32404313), we get a palindrome (63744736).

The spelling of 31340423 in words is "thirty-one million, three hundred forty thousand, four hundred twenty-three".