31090 has 8 divisors (see below), whose sum is σ = 55980. Its totient is φ = 12432.

The previous prime is 31081. The next prime is 31091. The reversal of 31090 is 9013.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 29241 + 1849 = 171^2 + 43^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 31090.

It is not an unprimeable number, because it can be changed into a prime (31091) 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, 1545 + ... + 1564.

2³¹⁰⁹⁰ is an apocalyptic number.

31090 is a deficient number, since it is larger than the sum of its proper divisors (24890).

31090 is a wasteful number, since it uses less digits than its factorization.

31090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3116.

The product of its (nonzero) digits is 27, while the sum is 13.

The square root of 31090 is about 176.3235662071. The cubic root of 31090 is about 31.4441776094. Note that the first 3 decimals are identical.

It can be divided in two parts, 310 and 90, that added together give a square (400 = 20²).

The spelling of 31090 in words is "thirty-one thousand, ninety".