31661030 has 32 divisors (see below), whose sum is σ = 60860160. Its totient is φ = 11823840.

The previous prime is 31661023. The next prime is 31661039. The reversal of 31661030 is 3016613.

It is a junction number, because it is equal to n+sod(n) for n = 31660993 and 31661011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31661039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12317 + ... + 14663.

It is an arithmetic number, because the mean of its divisors is an integer number (1901880).

Almost surely, 2^31661030 is an apocalyptic number.

31661030 is a deficient number, since it is larger than the sum of its proper divisors (29199130).

31661030 is a wasteful number, since it uses less digits than its factorization.

31661030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2444.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 31661030 is about 5626.8134854463. The cubic root of 31661030 is about 316.3552259632.

Adding to 31661030 its reverse (3016613), we get a palindrome (34677643).

The spelling of 31661030 in words is "thirty-one million, six hundred sixty-one thousand, thirty".