1198279021 has 2 divisors, whose sum is σ = 1198279022. Its totient is φ = 1198279020.

The previous prime is 1198278973. The next prime is 1198279037. The reversal of 1198279021 is 1209728911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1021761225 + 176517796 = 31965^2 + 13286^2 .

It is a cyclic number.

It is not a de Polignac number, because 1198279021 - 2¹⁵ = 1198246253 is a prime.

It is a super-2 number, since 2×1198279021² = 2871745224337436882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1198279081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 599139510 + 599139511.

It is an arithmetic number, because the mean of its divisors is an integer number (599139511).

Almost surely, 2^1198279021 is an apocalyptic number.

It is an amenable number.

1198279021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1198279021 is an equidigital number, since it uses as much as digits as its factorization.

1198279021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 40.

The square root of 1198279021 is about 34616.1670466272. The cubic root of 1198279021 is about 1062.1503225041.

The spelling of 1198279021 in words is "one billion, one hundred ninety-eight million, two hundred seventy-nine thousand, twenty-one".