31686061 has 8 divisors (see below), whose sum is σ = 35682048. Its totient is φ = 27876000.

The previous prime is 31686029. The next prime is 31686101. The reversal of 31686061 is 16068613.

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

It is a cyclic number.

It is not a de Polignac number, because 31686061 - 2⁵ = 31686029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31686761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46120 + ... + 46801.

It is an arithmetic number, because the mean of its divisors is an integer number (4460256).

Almost surely, 2^31686061 is an apocalyptic number.

31686061 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31686061 is a deficient number, since it is larger than the sum of its proper divisors (3995987).

31686061 is a wasteful number, since it uses less digits than its factorization.

31686061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92963.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 31686061 is about 5629.0373066804. The cubic root of 31686061 is about 316.4385734491.

It can be divided in two parts, 3168 and 6061, that added together give a palindrome (9229).

The spelling of 31686061 in words is "thirty-one million, six hundred eighty-six thousand, sixty-one".