878022251 has 2 divisors, whose sum is σ = 878022252. Its totient is φ = 878022250.

The previous prime is 878022209. The next prime is 878022311. The reversal of 878022251 is 152220878.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 878022251 - 2²² = 873827947 is a prime.

It is a super-2 number, since 2×878022251² = 1541846146502214002, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (878022151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439011125 + 439011126.

It is an arithmetic number, because the mean of its divisors is an integer number (439011126).

Almost surely, 2^878022251 is an apocalyptic number.

878022251 is a deficient number, since it is larger than the sum of its proper divisors (1).

878022251 is an equidigital number, since it uses as much as digits as its factorization.

878022251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 878022251 is about 29631.4402451180. The cubic root of 878022251 is about 957.5655370340.

The spelling of 878022251 in words is "eight hundred seventy-eight million, twenty-two thousand, two hundred fifty-one".