31437620197 has 2 divisors, whose sum is σ = 31437620198. Its totient is φ = 31437620196.

The previous prime is 31437620171. The next prime is 31437620293. The reversal of 31437620197 is 79102673413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22538716641 + 8898903556 = 150129^2 + 94334^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31437620197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31437620147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15718810098 + 15718810099.

It is an arithmetic number, because the mean of its divisors is an integer number (15718810099).

Almost surely, 2^31437620197 is an apocalyptic number.

It is an amenable number.

31437620197 is a deficient number, since it is larger than the sum of its proper divisors (1).

31437620197 is an equidigital number, since it uses as much as digits as its factorization.

31437620197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 43.

The spelling of 31437620197 in words is "thirty-one billion, four hundred thirty-seven million, six hundred twenty thousand, one hundred ninety-seven".