31661055 has 24 divisors (see below), whose sum is σ = 58108752. Its totient is φ = 15892224.

The previous prime is 31661053. The next prime is 31661057. The reversal of 31661055 is 55016613.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31661053) and next prime (31661057).

It is not a de Polignac number, because 31661055 - 2¹ = 31661053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31661053) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19929 + ... + 21458.

It is an arithmetic number, because the mean of its divisors is an integer number (2421198).

Almost surely, 2^31661055 is an apocalyptic number.

31661055 is a deficient number, since it is larger than the sum of its proper divisors (26447697).

31661055 is a wasteful number, since it uses less digits than its factorization.

31661055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41415 (or 41412 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 31661055 is about 5626.8157069518. The cubic root of 31661055 is about 316.3553092293.

Adding to 31661055 its reverse (55016613), we get a palindrome (86677668).

The spelling of 31661055 in words is "thirty-one million, six hundred sixty-one thousand, fifty-five".