1205138098 has 4 divisors (see below), whose sum is σ = 1807707150. Its totient is φ = 602569048.

The previous prime is 1205138059. The next prime is 1205138159. The reversal of 1205138098 is 8908315021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8908315021 = 25849 ⋅344629.

It can be written as a sum of positive squares in only one way, i.e., 659308329 + 545829769 = 25677^2 + 23363^2 .

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, 301284523 + ... + 301284526.

Almost surely, 2^1205138098 is an apocalyptic number.

1205138098 is a deficient number, since it is larger than the sum of its proper divisors (602569052).

1205138098 is an equidigital number, since it uses as much as digits as its factorization.

1205138098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602569051.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 1205138098 is about 34715.0989916492. The cubic root of 1205138098 is about 1064.1730884906.

The spelling of 1205138098 in words is "one billion, two hundred five million, one hundred thirty-eight thousand, ninety-eight".