31197097 has 2 divisors, whose sum is σ = 31197098. Its totient is φ = 31197096.

The previous prime is 31197083. The next prime is 31197109. The reversal of 31197097 is 79079113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23193856 + 8003241 = 4816^2 + 2829^2 .

It is an emirp because it is prime and its reverse (79079113) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31197097 is a prime.

It is a super-2 number, since 2×31197097² = 1946517722454818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31197007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15598548 + 15598549.

It is an arithmetic number, because the mean of its divisors is an integer number (15598549).

Almost surely, 2^31197097 is an apocalyptic number.

It is an amenable number.

31197097 is a deficient number, since it is larger than the sum of its proper divisors (1).

31197097 is an equidigital number, since it uses as much as digits as its factorization.

31197097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11907, while the sum is 37.

The square root of 31197097 is about 5585.4361512777. The cubic root of 31197097 is about 314.8024191370.

The spelling of 31197097 in words is "thirty-one million, one hundred ninety-seven thousand, ninety-seven".