31661061 has 8 divisors (see below), whose sum is σ = 43244544. Its totient is φ = 20592480.

The previous prime is 31661059. The next prime is 31661081. The reversal of 31661061 is 16016613.

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

It is not a de Polignac number, because 31661061 - 2¹ = 31661059 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31661081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128581 + ... + 128826.

It is an arithmetic number, because the mean of its divisors is an integer number (5405568).

Almost surely, 2^31661061 is an apocalyptic number.

It is an amenable number.

31661061 is a deficient number, since it is larger than the sum of its proper divisors (11583483).

31661061 is a wasteful number, since it uses less digits than its factorization.

31661061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257451.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 31661061 is about 5626.8162401131. The cubic root of 31661061 is about 316.3553292132.

Adding to 31661061 its reverse (16016613), we get a palindrome (47677674).

The spelling of 31661061 in words is "thirty-one million, six hundred sixty-one thousand, sixty-one".