31271690 has 16 divisors (see below), whose sum is σ = 56437992. Its totient is φ = 12475584.

The previous prime is 31271689. The next prime is 31271717. The reversal of 31271690 is 9617213.

It can be written as a sum of positive squares in 4 ways, for example, as 22193521 + 9078169 = 4711^2 + 3013^2 .

It is a super-2 number, since 2×31271690² = 1955837190912200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 32 + ... + 7908.

Almost surely, 2^31271690 is an apocalyptic number.

31271690 is a deficient number, since it is larger than the sum of its proper divisors (25166302).

31271690 is a wasteful number, since it uses less digits than its factorization.

31271690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8281.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 31271690 is about 5592.1096198125. The cubic root of 31271690 is about 315.0531194537.

The spelling of 31271690 in words is "thirty-one million, two hundred seventy-one thousand, six hundred ninety".