31675381 has 2 divisors, whose sum is σ = 31675382. Its totient is φ = 31675380.

The previous prime is 31675379. The next prime is 31675417. The reversal of 31675381 is 18357613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29322225 + 2353156 = 5415^2 + 1534^2 .

It is an emirp because it is prime and its reverse (18357613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31675381 - 2¹ = 31675379 is a prime.

It is a super-2 number, since 2×31675381² = 2006659522990322, which contains 22 as substring.

Together with 31675379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31675361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15837690 + 15837691.

It is an arithmetic number, because the mean of its divisors is an integer number (15837691).

Almost surely, 2^31675381 is an apocalyptic number.

It is an amenable number.

31675381 is a deficient number, since it is larger than the sum of its proper divisors (1).

31675381 is an equidigital number, since it uses as much as digits as its factorization.

31675381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

The square root of 31675381 is about 5628.0885742852. The cubic root of 31675381 is about 316.4030168707.

The spelling of 31675381 in words is "thirty-one million, six hundred seventy-five thousand, three hundred eighty-one".