870641175787921 has 2 divisors, whose sum is σ = 870641175787922. Its totient is φ = 870641175787920.

The previous prime is 870641175787837. The next prime is 870641175787963. The reversal of 870641175787921 is 129787571146078.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 833796579287296 + 36844596500625 = 28875536^2 + 6069975^2 .

It is a cyclic number.

It is not a de Polignac number, because 870641175787921 - 2⁷ = 870641175787793 is a prime.

It is a super-3 number, since 3×870641175787921³ (a number of 46 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (870641175587921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435320587893960 + 435320587893961.

It is an arithmetic number, because the mean of its divisors is an integer number (435320587893961).

Almost surely, 2^{870641175787921} is an apocalyptic number.

It is an amenable number.

870641175787921 is a deficient number, since it is larger than the sum of its proper divisors (1).

870641175787921 is an equidigital number, since it uses as much as digits as its factorization.

870641175787921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 331914240, while the sum is 73.

The spelling of 870641175787921 in words is "eight hundred seventy trillion, six hundred forty-one billion, one hundred seventy-five million, seven hundred eighty-seven thousand, nine hundred twenty-one".