31771136 has 20 divisors (see below), whose sum is σ = 63481242. Its totient is φ = 15885312.

The previous prime is 31771127. The next prime is 31771139. The reversal of 31771136 is 63117713.

It can be written as a sum of positive squares in only one way, i.e., 28729600 + 3041536 = 5360^2 + 1744^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31771099 and 31771108.

It is not an unprimeable number, because it can be changed into a prime (31771139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30515 + ... + 31538.

Almost surely, 2^31771136 is an apocalyptic number.

It is an amenable number.

31771136 is a deficient number, since it is larger than the sum of its proper divisors (31710106).

31771136 is an frugal number, since it uses more digits than its factorization.

31771136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62071 (or 62055 counting only the distinct ones).

The product of its digits is 2646, while the sum is 29.

The square root of 31771136 is about 5636.5890394812. The cubic root of 31771136 is about 316.7215259835.

Adding to 31771136 its reverse (63117713), we get a palindrome (94888849).

The spelling of 31771136 in words is "thirty-one million, seven hundred seventy-one thousand, one hundred thirty-six".