1228521982 has 4 divisors (see below), whose sum is σ = 1842782976. Its totient is φ = 614260990.

The previous prime is 1228521979. The next prime is 1228522027. The reversal of 1228521982 is 2891258221.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307130494 + ... + 307130497.

It is an arithmetic number, because the mean of its divisors is an integer number (460695744).

Almost surely, 2^1228521982 is an apocalyptic number.

1228521982 is a deficient number, since it is larger than the sum of its proper divisors (614260994).

1228521982 is an equidigital number, since it uses as much as digits as its factorization.

1228521982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614260993.

The product of its digits is 46080, while the sum is 40.

The square root of 1228521982 is about 35050.2779161592. The cubic root of 1228521982 is about 1071.0119352148.

The spelling of 1228521982 in words is "one billion, two hundred twenty-eight million, five hundred twenty-one thousand, nine hundred eighty-two".