31404113 has 4 divisors (see below), whose sum is σ = 33819828. Its totient is φ = 28988400.

The previous prime is 31404101. The next prime is 31404119. The reversal of 31404113 is 31140413.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15904144 + 15499969 = 3988^2 + 3937^2 .

It is a cyclic number.

It is not a de Polignac number, because 31404113 - 2⁸ = 31403857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31404091 and 31404100.

It is not an unprimeable number, because it can be changed into a prime (31404119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1207838 + ... + 1207863.

It is an arithmetic number, because the mean of its divisors is an integer number (8454957).

Almost surely, 2^31404113 is an apocalyptic number.

It is an amenable number.

31404113 is a deficient number, since it is larger than the sum of its proper divisors (2415715).

31404113 is a wasteful number, since it uses less digits than its factorization.

31404113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2415714.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 31404113 is about 5603.9372765940. The cubic root of 31404113 is about 315.4972008562.

Adding to 31404113 its reverse (31140413), we get a palindrome (62544526).

The spelling of 31404113 in words is "thirty-one million, four hundred four thousand, one hundred thirteen".