1022155 has 4 divisors (see below), whose sum is σ = 1226592. Its totient is φ = 817720.

The previous prime is 1022141. The next prime is 1022167. The reversal of 1022155 is 5512201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5512201 = 739 ⋅7459.

It is not a de Polignac number, because 1022155 - 2⁵ = 1022123 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102211 + ... + 102220.

It is an arithmetic number, because the mean of its divisors is an integer number (306648).

2^1022155 is an apocalyptic number.

1022155 is a deficient number, since it is larger than the sum of its proper divisors (204437).

1022155 is an equidigital number, since it uses as much as digits as its factorization.

1022155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204436.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 1022155 is about 1011.0168148948. The cubic root of 1022155 is about 100.7331123293.

Adding to 1022155 its reverse (5512201), we get a palindrome (6534356).

The spelling of 1022155 in words is "one million, twenty-two thousand, one hundred fifty-five".