31422997 has 2 divisors, whose sum is σ = 31422998. Its totient is φ = 31422996.

The previous prime is 31422983. The next prime is 31423033. The reversal of 31422997 is 79922413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30846916 + 576081 = 5554^2 + 759^2 .

It is an emirp because it is prime and its reverse (79922413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31422997 - 2¹⁹ = 30898709 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 (31422497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15711498 + 15711499.

It is an arithmetic number, because the mean of its divisors is an integer number (15711499).

Almost surely, 2^31422997 is an apocalyptic number.

It is an amenable number.

31422997 is a deficient number, since it is larger than the sum of its proper divisors (1).

31422997 is an equidigital number, since it uses as much as digits as its factorization.

31422997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 37.

The square root of 31422997 is about 5605.6219101898. The cubic root of 31422997 is about 315.5604267076.

The spelling of 31422997 in words is "thirty-one million, four hundred twenty-two thousand, nine hundred ninety-seven".