1198490521 has 4 divisors (see below), whose sum is σ = 1199465344. Its totient is φ = 1197515700.

The previous prime is 1198490519. The next prime is 1198490549. The reversal of 1198490521 is 1250948911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1250948911 = 229 ⋅5462659.

It is a cyclic number.

It is not a de Polignac number, because 1198490521 - 2¹ = 1198490519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1198490921) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 485565 + ... + 488026.

It is an arithmetic number, because the mean of its divisors is an integer number (299866336).

Almost surely, 2^1198490521 is an apocalyptic number.

It is an amenable number.

1198490521 is a deficient number, since it is larger than the sum of its proper divisors (974823).

1198490521 is an equidigital number, since it uses as much as digits as its factorization.

1198490521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974822.

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 1198490521 is about 34619.2218427855. The cubic root of 1198490521 is about 1062.2128097807.

The spelling of 1198490521 in words is "one billion, one hundred ninety-eight million, four hundred ninety thousand, five hundred twenty-one".