31124405 has 32 divisors (see below), whose sum is σ = 42577920. Its totient is φ = 21669120.

The previous prime is 31124377. The next prime is 31124411. The reversal of 31124405 is 50442113.

It is not a de Polignac number, because 31124405 - 2²⁴ = 14347189 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 162860 + ... + 163050.

It is an arithmetic number, because the mean of its divisors is an integer number (1330560).

Almost surely, 2^31124405 is an apocalyptic number.

It is an amenable number.

31124405 is a deficient number, since it is larger than the sum of its proper divisors (11453515).

31124405 is a wasteful number, since it uses less digits than its factorization.

31124405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 31124405 is about 5578.9250756754. The cubic root of 31124405 is about 314.5577231416.

Adding to 31124405 its reverse (50442113), we get a palindrome (81566518).

The spelling of 31124405 in words is "thirty-one million, one hundred twenty-four thousand, four hundred five".