31438073 has 2 divisors, whose sum is σ = 31438074. Its totient is φ = 31438072.

The previous prime is 31438037. The next prime is 31438081. The reversal of 31438073 is 37083413.

Together with previous prime (31438037) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22629049 + 8809024 = 4757^2 + 2968^2 .

It is an emirp because it is prime and its reverse (37083413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31438073 - 2⁸ = 31437817 is a prime.

It is not a weakly prime, because it can be changed into another prime (31438013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15719036 + 15719037.

It is an arithmetic number, because the mean of its divisors is an integer number (15719037).

Almost surely, 2^31438073 is an apocalyptic number.

It is an amenable number.

31438073 is a deficient number, since it is larger than the sum of its proper divisors (1).

31438073 is an equidigital number, since it uses as much as digits as its factorization.

31438073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 31438073 is about 5606.9664703831. The cubic root of 31438073 is about 315.6108847460.

The spelling of 31438073 in words is "thirty-one million, four hundred thirty-eight thousand, seventy-three".