31485197 has 2 divisors, whose sum is σ = 31485198. Its totient is φ = 31485196.

The previous prime is 31485193. The next prime is 31485221. The reversal of 31485197 is 79158413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19193161 + 12292036 = 4381^2 + 3506^2 .

It is a cyclic number.

It is not a de Polignac number, because 31485197 - 2² = 31485193 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31485197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31485191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15742598 + 15742599.

It is an arithmetic number, because the mean of its divisors is an integer number (15742599).

Almost surely, 2^31485197 is an apocalyptic number.

It is an amenable number.

31485197 is a deficient number, since it is larger than the sum of its proper divisors (1).

31485197 is an equidigital number, since it uses as much as digits as its factorization.

31485197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 38.

The square root of 31485197 is about 5611.1671691369. The cubic root of 31485197 is about 315.7685006651.

The spelling of 31485197 in words is "thirty-one million, four hundred eighty-five thousand, one hundred ninety-seven".