897644129 has 2 divisors, whose sum is σ = 897644130. Its totient is φ = 897644128.

The previous prime is 897644107. The next prime is 897644159. The reversal of 897644129 is 921446798.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 489604129 + 408040000 = 22127^2 + 20200^2 .

It is a cyclic number.

It is not a de Polignac number, because 897644129 - 2¹² = 897640033 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (897644159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 448822064 + 448822065.

It is an arithmetic number, because the mean of its divisors is an integer number (448822065).

Almost surely, 2^897644129 is an apocalyptic number.

It is an amenable number.

897644129 is a deficient number, since it is larger than the sum of its proper divisors (1).

897644129 is an equidigital number, since it uses as much as digits as its factorization.

897644129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 50.

The square root of 897644129 is about 29960.7097546103. The cubic root of 897644129 is about 964.6462157182.

The spelling of 897644129 in words is "eight hundred ninety-seven million, six hundred forty-four thousand, one hundred twenty-nine".