31343405 has 8 divisors (see below), whose sum is σ = 38322072. Its totient is φ = 24601408.

The previous prime is 31343401. The next prime is 31343413. The reversal of 31343405 is 50434313.

It can be written as a sum of positive squares in 4 ways, for example, as 1771561 + 29571844 = 1331^2 + 5438^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31343405 - 2² = 31343401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31343401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58874 + ... + 59403.

It is an arithmetic number, because the mean of its divisors is an integer number (4790259).

Almost surely, 2^31343405 is an apocalyptic number.

It is an amenable number.

31343405 is a deficient number, since it is larger than the sum of its proper divisors (6978667).

31343405 is a wasteful number, since it uses less digits than its factorization.

31343405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118335.

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 31343405 is about 5598.5181074995. The cubic root of 31343405 is about 315.2937714607.

Adding to 31343405 its reverse (50434313), we get a palindrome (81777718).

The spelling of 31343405 in words is "thirty-one million, three hundred forty-three thousand, four hundred five".