31861036 has 12 divisors (see below), whose sum is σ = 55934928. Its totient is φ = 15879632.

The previous prime is 31861031. The next prime is 31861079. The reversal of 31861036 is 63016813.

It is a super-2 number, since 2×31861036² = 2030251229986592, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31860995 and 31861013.

It is not an unprimeable number, because it can be changed into a prime (31861031) 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, 11296 + ... + 13831.

It is an arithmetic number, because the mean of its divisors is an integer number (4661244).

Almost surely, 2^31861036 is an apocalyptic number.

It is an amenable number.

31861036 is a deficient number, since it is larger than the sum of its proper divisors (24073892).

31861036 is a wasteful number, since it uses less digits than its factorization.

31861036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25448 (or 25446 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 31861036 is about 5644.5580872199. The cubic root of 31861036 is about 317.0199777105.

Adding to 31861036 its reverse (63016813), we get a palindrome (94877849).

The spelling of 31861036 in words is "thirty-one million, eight hundred sixty-one thousand, thirty-six".