31661028017 has 4 divisors (see below), whose sum is σ = 31685365236. Its totient is φ = 31636690800.

The previous prime is 31661028001. The next prime is 31661028037. The reversal of 31661028017 is 71082016613.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2830346401 + 28830681616 = 53201^2 + 169796^2 .

It is a cyclic number.

It is not a de Polignac number, because 31661028017 - 2⁴ = 31661028001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31661028037) 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, 12166658 + ... + 12169259.

It is an arithmetic number, because the mean of its divisors is an integer number (7921341309).

Almost surely, 2^31661028017 is an apocalyptic number.

It is an amenable number.

31661028017 is a deficient number, since it is larger than the sum of its proper divisors (24337219).

31661028017 is a wasteful number, since it uses less digits than its factorization.

31661028017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24337218.

The product of its (nonzero) digits is 12096, while the sum is 35.

The spelling of 31661028017 in words is "thirty-one billion, six hundred sixty-one million, twenty-eight thousand, seventeen".