1811522 has 4 divisors (see below), whose sum is σ = 2717286. Its totient is φ = 905760.

The previous prime is 1811519. The next prime is 1811527. The reversal of 1811522 is 2251181.

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: 2251181 = 241 ⋅9341.

It can be written as a sum of positive squares in only one way, i.e., 1540081 + 271441 = 1241^2 + 521^2 .

It is a super-2 number, since 2×1811522² = 6563223912968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1811494 and 1811503.

It is not an unprimeable number, because it can be changed into a prime (1811527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 452879 + ... + 452882.

2^1811522 is an apocalyptic number.

1811522 is a deficient number, since it is larger than the sum of its proper divisors (905764).

1811522 is an equidigital number, since it uses as much as digits as its factorization.

1811522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905763.

The product of its digits is 160, while the sum is 20.

The square root of 1811522 is about 1345.9279326918. The cubic root of 1811522 is about 121.9030404032.

The spelling of 1811522 in words is "one million, eight hundred eleven thousand, five hundred twenty-two".