1131570 has 80 divisors (see below), whose sum is σ = 3345408. Its totient is φ = 272160.

The previous prime is 1131569. The next prime is 1131617. The reversal of 1131570 is 751311.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 8847 + ... + 8973.

2^1131570 is an apocalyptic number.

1131570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1131570, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1672704).

1131570 is an abundant number, since it is smaller than the sum of its proper divisors (2213838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1131570 is a wasteful number, since it uses less digits than its factorization.

1131570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 105, while the sum is 18.

The square root of 1131570 is about 1063.7527908307. The cubic root of 1131570 is about 104.2062597934.

Adding to 1131570 its reverse (751311), we get a palindrome (1882881).

The spelling of 1131570 in words is "one million, one hundred thirty-one thousand, five hundred seventy".