897169781939 has 2 divisors, whose sum is σ = 897169781940. Its totient is φ = 897169781938.

The previous prime is 897169781897. The next prime is 897169781983. The reversal of 897169781939 is 939187961798.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 897169781939 - 2¹² = 897169777843 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 897169781939.

It is not a weakly prime, because it can be changed into another prime (897160781939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 448584890969 + 448584890970.

It is an arithmetic number, because the mean of its divisors is an integer number (448584890970).

Almost surely, 2^897169781939 is an apocalyptic number.

897169781939 is a deficient number, since it is larger than the sum of its proper divisors (1).

897169781939 is an equidigital number, since it uses as much as digits as its factorization.

897169781939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 370355328, while the sum is 77.

The spelling of 897169781939 in words is "eight hundred ninety-seven billion, one hundred sixty-nine million, seven hundred eighty-one thousand, nine hundred thirty-nine".