1163531 has 4 divisors (see below), whose sum is σ = 1231992. Its totient is φ = 1095072.

The previous prime is 1163521. The next prime is 1163543. The reversal of 1163531 is 1353611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1353611 = 7 ⋅193373.

It is not a de Polignac number, because 1163531 - 2⁶ = 1163467 is a prime.

It is a super-2 number, since 2×1163531² = 2707608775922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1163521) 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, 34205 + ... + 34238.

It is an arithmetic number, because the mean of its divisors is an integer number (307998).

2^1163531 is an apocalyptic number.

1163531 is a deficient number, since it is larger than the sum of its proper divisors (68461).

1163531 is an equidigital number, since it uses as much as digits as its factorization.

1163531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68460.

The product of its digits is 270, while the sum is 20.

The square root of 1163531 is about 1078.6709414831. The cubic root of 1163531 is about 105.1782610606.

The spelling of 1163531 in words is "one million, one hundred sixty-three thousand, five hundred thirty-one".