31340623 has 4 divisors (see below), whose sum is σ = 31871880. Its totient is φ = 30809368.

The previous prime is 31340609. The next prime is 31340627. The reversal of 31340623 is 32604313.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31340623 - 2²¹ = 29243471 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31340594 and 31340603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31340627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265540 + ... + 265657.

It is an arithmetic number, because the mean of its divisors is an integer number (7967970).

Almost surely, 2^31340623 is an apocalyptic number.

31340623 is a deficient number, since it is larger than the sum of its proper divisors (531257).

31340623 is an equidigital number, since it uses as much as digits as its factorization.

31340623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531256.

The product of its (nonzero) digits is 1296, while the sum is 22.

The square root of 31340623 is about 5598.2696433809. The cubic root of 31340623 is about 315.2844428292.

Adding to 31340623 its reverse (32604313), we get a palindrome (63944936).

The spelling of 31340623 in words is "thirty-one million, three hundred forty thousand, six hundred twenty-three".