1115621 has 4 divisors (see below), whose sum is σ = 1201452. Its totient is φ = 1029792.

The previous prime is 1115599. The next prime is 1115627. The reversal of 1115621 is 1265111.

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

It can be written as a sum of positive squares in 2 ways, for example, as 330625 + 784996 = 575^2 + 886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1115621 - 2¹⁸ = 853477 is a prime.

It is a super-2 number, since 2×1115621² = 2489220431282, 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 1115621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1115627) 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, 42896 + ... + 42921.

It is an arithmetic number, because the mean of its divisors is an integer number (300363).

2^1115621 is an apocalyptic number.

It is an amenable number.

1115621 is a deficient number, since it is larger than the sum of its proper divisors (85831).

1115621 is an equidigital number, since it uses as much as digits as its factorization.

1115621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85830.

The product of its digits is 60, while the sum is 17.

The square root of 1115621 is about 1056.2296151879. The cubic root of 1115621 is about 103.7143604301.

The spelling of 1115621 in words is "one million, one hundred fifteen thousand, six hundred twenty-one".