31020201397 has 2 divisors, whose sum is σ = 31020201398. Its totient is φ = 31020201396.

The previous prime is 31020201349. The next prime is 31020201431. The reversal of 31020201397 is 79310202013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23140798641 + 7879402756 = 152121^2 + 88766^2 .

It is a cyclic number.

It is not a de Polignac number, because 31020201397 - 2¹⁹ = 31019677109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31020201337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15510100698 + 15510100699.

It is an arithmetic number, because the mean of its divisors is an integer number (15510100699).

Almost surely, 2^31020201397 is an apocalyptic number.

It is an amenable number.

31020201397 is a deficient number, since it is larger than the sum of its proper divisors (1).

31020201397 is an equidigital number, since it uses as much as digits as its factorization.

31020201397 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 28.

The spelling of 31020201397 in words is "thirty-one billion, twenty million, two hundred one thousand, three hundred ninety-seven".