878908125001 has 3 divisors (see below), whose sum is σ = 878909062503. Its totient is φ = 878907187500.

The previous prime is 878908124993. The next prime is 878908125041. The reversal of 878908125001 is 100521809878.

The square root of 878908125001 is 937501.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1576169401 + 877331955600 = 39701^2 + 936660^2 .

It is not a de Polignac number, because 878908125001 - 2³ = 878908124993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (878908125041) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 468751 + ... + 1406251.

It is an arithmetic number, because the mean of its divisors is an integer number (292969687501).

Almost surely, 2^878908125001 is an apocalyptic number.

878908125001 is the 937501-st square number.

878908125001 is the 468751-st centered octagonal number.

It is an amenable number.

878908125001 is a deficient number, since it is larger than the sum of its proper divisors (937502).

878908125001 is an frugal number, since it uses more digits than its factorization.

878908125001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1875002 (or 937501 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 49.

Multiplying 878908125001 by its sum of digits (49), we get a square (43066498125049 = 6562507²).

The spelling of 878908125001 in words is "eight hundred seventy-eight billion, nine hundred eight million, one hundred twenty-five thousand, one".