879217961 has 2 divisors, whose sum is σ = 879217962. Its totient is φ = 879217960.

The previous prime is 879217919. The next prime is 879217993. The reversal of 879217961 is 169712978.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 668532736 + 210685225 = 25856^2 + 14515^2 .

It is a cyclic number.

It is not a de Polignac number, because 879217961 - 2¹⁰ = 879216937 is a prime.

It is not a weakly prime, because it can be changed into another prime (879214961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439608980 + 439608981.

It is an arithmetic number, because the mean of its divisors is an integer number (439608981).

Almost surely, 2^879217961 is an apocalyptic number.

It is an amenable number.

879217961 is a deficient number, since it is larger than the sum of its proper divisors (1).

879217961 is an equidigital number, since it uses as much as digits as its factorization.

879217961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 50.

The square root of 879217961 is about 29651.6097539408. The cubic root of 879217961 is about 958.0000177969. Note that the first 4 decimals are identical.

The spelling of 879217961 in words is "eight hundred seventy-nine million, two hundred seventeen thousand, nine hundred sixty-one".