31874681 has 2 divisors, whose sum is σ = 31874682. Its totient is φ = 31874680.

The previous prime is 31874663. The next prime is 31874699. The reversal of 31874681 is 18647813.

It is a balanced prime because it is at equal distance from previous prime (31874663) and next prime (31874699).

It can be written as a sum of positive squares in only one way, i.e., 17774656 + 14100025 = 4216^2 + 3755^2 .

It is an emirp because it is prime and its reverse (18647813) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31874681 is a prime.

It is a super-2 number, since 2×31874681² = 2031990577703522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31874621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15937340 + 15937341.

It is an arithmetic number, because the mean of its divisors is an integer number (15937341).

Almost surely, 2^31874681 is an apocalyptic number.

It is an amenable number.

31874681 is a deficient number, since it is larger than the sum of its proper divisors (1).

31874681 is an equidigital number, since it uses as much as digits as its factorization.

31874681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 38.

The square root of 31874681 is about 5645.7666441326. The cubic root of 31874681 is about 317.0652275492.

The spelling of 31874681 in words is "thirty-one million, eight hundred seventy-four thousand, six hundred eighty-one".