31285049 has 4 divisors (see below), whose sum is σ = 33125364. Its totient is φ = 29444736.

The previous prime is 31285043. The next prime is 31285061. The reversal of 31285049 is 94058213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94058213 = 59 ⋅1594207.

It can be written as a sum of positive squares in 2 ways, for example, as 10445824 + 20839225 = 3232^2 + 4565^2 .

It is a cyclic number.

It is not a de Polignac number, because 31285049 - 2²⁴ = 14507833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31285043) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 920132 + ... + 920165.

It is an arithmetic number, because the mean of its divisors is an integer number (8281341).

Almost surely, 2^31285049 is an apocalyptic number.

It is an amenable number.

31285049 is a deficient number, since it is larger than the sum of its proper divisors (1840315).

31285049 is a wasteful number, since it uses less digits than its factorization.

31285049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1840314.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 31285049 is about 5593.3039431091. The cubic root of 31285049 is about 315.0979757379.

The spelling of 31285049 in words is "thirty-one million, two hundred eighty-five thousand, forty-nine".