1198531 has 4 divisors (see below), whose sum is σ = 1201464. Its totient is φ = 1195600.

The previous prime is 1198523. The next prime is 1198537. The reversal of 1198531 is 1358911.

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

It is a cyclic number.

It is not a de Polignac number, because 1198531 - 2³ = 1198523 is a prime.

It is a super-2 number, since 2×1198531² = 2872953115922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1198531.

It is not an unprimeable number, because it can be changed into a prime (1198537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 730 + ... + 1711.

It is an arithmetic number, because the mean of its divisors is an integer number (300366).

2^1198531 is an apocalyptic number.

1198531 is a deficient number, since it is larger than the sum of its proper divisors (2933).

1198531 is an equidigital number, since it uses as much as digits as its factorization.

1198531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2932.

The product of its digits is 1080, while the sum is 28.

The square root of 1198531 is about 1094.7744059851. The cubic root of 1198531 is about 106.2224768387. Note that the first 3 decimals are identical.

The spelling of 1198531 in words is "one million, one hundred ninety-eight thousand, five hundred thirty-one".