3131221097 has 2 divisors, whose sum is σ = 3131221098. Its totient is φ = 3131221096.

The previous prime is 3131221087. The next prime is 3131221111. The reversal of 3131221097 is 7901221313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2072434576 + 1058786521 = 45524^2 + 32539^2 .

It is an emirp because it is prime and its reverse (7901221313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3131221097 - 2¹⁸ = 3130958953 is a prime.

It is not a weakly prime, because it can be changed into another prime (3131221087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1565610548 + 1565610549.

It is an arithmetic number, because the mean of its divisors is an integer number (1565610549).

Almost surely, 2^3131221097 is an apocalyptic number.

It is an amenable number.

3131221097 is a deficient number, since it is larger than the sum of its proper divisors (1).

3131221097 is an equidigital number, since it uses as much as digits as its factorization.

3131221097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 3131221097 is about 55957.3149552407. The cubic root of 3131221097 is about 1462.9783912572.

The spelling of 3131221097 in words is "three billion, one hundred thirty-one million, two hundred twenty-one thousand, ninety-seven".