971859489649 has 2 divisors, whose sum is σ = 971859489650. Its totient is φ = 971859489648.

The previous prime is 971859489617. The next prime is 971859489697. The reversal of 971859489649 is 946984958179.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 547589640049 + 424269849600 = 739993^2 + 651360^2 .

It is a cyclic number.

It is not a de Polignac number, because 971859489649 - 2⁵ = 971859489617 is a prime.

It is not a weakly prime, because it can be changed into another prime (971859409649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485929744824 + 485929744825.

It is an arithmetic number, because the mean of its divisors is an integer number (485929744825).

Almost surely, 2^971859489649 is an apocalyptic number.

It is an amenable number.

971859489649 is a deficient number, since it is larger than the sum of its proper divisors (1).

971859489649 is an equidigital number, since it uses as much as digits as its factorization.

971859489649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1410877440, while the sum is 79.

The spelling of 971859489649 in words is "nine hundred seventy-one billion, eight hundred fifty-nine million, four hundred eighty-nine thousand, six hundred forty-nine".