1205531 has 8 divisors (see below), whose sum is σ = 1289280. Its totient is φ = 1123848.

The previous prime is 1205527. The next prime is 1205537. The reversal of 1205531 is 1355021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1205531 - 2² = 1205527 is a prime.

It is a super-2 number, since 2×1205531² = 2906609983922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1205537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 800 + ... + 1746.

It is an arithmetic number, because the mean of its divisors is an integer number (161160).

2^1205531 is an apocalyptic number.

1205531 is a deficient number, since it is larger than the sum of its proper divisors (83749).

1205531 is an equidigital number, since it uses as much as digits as its factorization.

1205531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 1205531 is about 1097.9667572381. The cubic root of 1205531 is about 106.4288724009.

The spelling of 1205531 in words is "one million, two hundred five thousand, five hundred thirty-one".