878923117421 has 2 divisors, whose sum is σ = 878923117422. Its totient is φ = 878923117420.

The previous prime is 878923117349. The next prime is 878923117463. The reversal of 878923117421 is 124711329878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 823220509225 + 55702608196 = 907315^2 + 236014^2 .

It is a cyclic number.

It is not a de Polignac number, because 878923117421 - 2¹⁴ = 878923101037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (878923117321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439461558710 + 439461558711.

It is an arithmetic number, because the mean of its divisors is an integer number (439461558711).

Almost surely, 2^878923117421 is an apocalyptic number.

It is an amenable number.

878923117421 is a deficient number, since it is larger than the sum of its proper divisors (1).

878923117421 is an equidigital number, since it uses as much as digits as its factorization.

878923117421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1354752, while the sum is 53.

The spelling of 878923117421 in words is "eight hundred seventy-eight billion, nine hundred twenty-three million, one hundred seventeen thousand, four hundred twenty-one".