31421597 has 2 divisors, whose sum is σ = 31421598. Its totient is φ = 31421596.

The previous prime is 31421581. The next prime is 31421617. The reversal of 31421597 is 79512413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28793956 + 2627641 = 5366^2 + 1621^2 .

It is an emirp because it is prime and its reverse (79512413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31421597 - 2⁴ = 31421581 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31421557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15710798 + 15710799.

It is an arithmetic number, because the mean of its divisors is an integer number (15710799).

Almost surely, 2^31421597 is an apocalyptic number.

It is an amenable number.

31421597 is a deficient number, since it is larger than the sum of its proper divisors (1).

31421597 is an equidigital number, since it uses as much as digits as its factorization.

31421597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 32.

The square root of 31421597 is about 5605.4970341621. The cubic root of 31421597 is about 315.5557402126. Note that the first 3 decimals are identical.

The spelling of 31421597 in words is "thirty-one million, four hundred twenty-one thousand, five hundred ninety-seven".