978154223 has 2 divisors, whose sum is σ = 978154224. Its totient is φ = 978154222.

The previous prime is 978154193. The next prime is 978154231. The reversal of 978154223 is 322451879.

It is a strong prime.

It is an emirp because it is prime and its reverse (322451879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 978154223 - 2¹² = 978150127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978114223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489077111 + 489077112.

It is an arithmetic number, because the mean of its divisors is an integer number (489077112).

Almost surely, 2^978154223 is an apocalyptic number.

978154223 is a deficient number, since it is larger than the sum of its proper divisors (1).

978154223 is an equidigital number, since it uses as much as digits as its factorization.

978154223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 41.

The square root of 978154223 is about 31275.4571988964. The cubic root of 978154223 is about 992.6643948088.

The spelling of 978154223 in words is "nine hundred seventy-eight million, one hundred fifty-four thousand, two hundred twenty-three".