1022549978 has 4 divisors (see below), whose sum is σ = 1533824970. Its totient is φ = 511274988.

The previous prime is 1022549971. The next prime is 1022549981. The reversal of 1022549978 is 8799452201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8799452201 = 13241 ⋅664561.

It can be written as a sum of positive squares in only one way, i.e., 906190609 + 116359369 = 30103^2 + 10787^2 .

It is not an unprimeable number, because it can be changed into a prime (1022549971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255637493 + ... + 255637496.

Almost surely, 2^1022549978 is an apocalyptic number.

1022549978 is a deficient number, since it is larger than the sum of its proper divisors (511274992).

1022549978 is an equidigital number, since it uses as much as digits as its factorization.

1022549978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511274991.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 1022549978 is about 31977.3353799218. The cubic root of 1022549978 is about 1007.4608565187.

The spelling of 1022549978 in words is "one billion, twenty-two million, five hundred forty-nine thousand, nine hundred seventy-eight".