31128849 has 12 divisors (see below), whose sum is σ = 45701812. Its totient is φ = 20412000.

The previous prime is 31128847. The next prime is 31128857. The reversal of 31128849 is 94882113.

It can be written as a sum of positive squares in 2 ways, for example, as 8661249 + 22467600 = 2943^2 + 4740^2 .

It is not a de Polignac number, because 31128849 - 2¹ = 31128847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31128847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27802 + ... + 28899.

Almost surely, 2^31128849 is an apocalyptic number.

It is an amenable number.

31128849 is a deficient number, since it is larger than the sum of its proper divisors (14572963).

31128849 is a wasteful number, since it uses less digits than its factorization.

31128849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56768 (or 56765 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 31128849 is about 5579.3233460698. The cubic root of 31128849 is about 314.5726934733.

The spelling of 31128849 in words is "thirty-one million, one hundred twenty-eight thousand, eight hundred forty-nine".