31616293258681 has 8 divisors (see below), whose sum is σ = 33478987144680. Its totient is φ = 29753922920448.

The previous prime is 31616293258663. The next prime is 31616293258687. The reversal of 31616293258681 is 18685239261613.

It can be written as a sum of positive squares in 4 ways, for example, as 6738982362025 + 24877310896656 = 2595955^2 + 4987716^2 .

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 31616293258681 - 2¹⁷ = 31616293127609 is a prime.

It is a super-2 number, since 2×31616293258681² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31616293258687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80685736 + ... + 81076633.

It is an arithmetic number, because the mean of its divisors is an integer number (4184873393085).

Almost surely, 2^{31616293258681} is an apocalyptic number.

It is an amenable number.

31616293258681 is a deficient number, since it is larger than the sum of its proper divisors (1862693885999).

31616293258681 is a wasteful number, since it uses less digits than its factorization.

31616293258681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161773883.

The product of its digits is 22394880, while the sum is 61.

The spelling of 31616293258681 in words is "thirty-one trillion, six hundred sixteen billion, two hundred ninety-three million, two hundred fifty-eight thousand, six hundred eighty-one".