31144013 has 4 divisors (see below), whose sum is σ = 31260060. Its totient is φ = 31027968.

The previous prime is 31143971. The next prime is 31144027. The reversal of 31144013 is 31044113.

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 2553604 + 28590409 = 1598^2 + 5347^2 .

It is a cyclic number.

It is not a de Polignac number, because 31144013 - 2⁸ = 31143757 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31143982 and 31144000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31144313) 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, 57620 + ... + 58157.

It is an arithmetic number, because the mean of its divisors is an integer number (7815015).

Almost surely, 2^31144013 is an apocalyptic number.

It is an amenable number.

31144013 is a deficient number, since it is larger than the sum of its proper divisors (116047).

31144013 is a wasteful number, since it uses less digits than its factorization.

31144013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116046.

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

The square root of 31144013 is about 5580.6821267655. The cubic root of 31144013 is about 314.6237651330.

Adding to 31144013 its reverse (31044113), we get a palindrome (62188126).

The spelling of 31144013 in words is "thirty-one million, one hundred forty-four thousand, thirteen".