1131621 has 8 divisors (see below), whose sum is σ = 1588320. Its totient is φ = 714672.

The previous prime is 1131617. The next prime is 1131629. The reversal of 1131621 is 1261311.

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

It is not a de Polignac number, because 1131621 - 2² = 1131617 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1131621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131629) 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, 9870 + ... + 9983.

It is an arithmetic number, because the mean of its divisors is an integer number (198540).

2^1131621 is an apocalyptic number.

It is an amenable number.

1131621 is a deficient number, since it is larger than the sum of its proper divisors (456699).

1131621 is a wasteful number, since it uses less digits than its factorization.

1131621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19875.

The product of its digits is 36, while the sum is 15.

The square root of 1131621 is about 1063.7767622955. The cubic root of 1131621 is about 104.2078252996.

Adding to 1131621 its reverse (1261311), we get a palindrome (2392932).

The spelling of 1131621 in words is "one million, one hundred thirty-one thousand, six hundred twenty-one".