1020155 has 8 divisors (see below), whose sum is σ = 1229712. Its totient is φ = 812448.

The previous prime is 1020143. The next prime is 1020157. The reversal of 1020155 is 5510201.

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

It is a cyclic number.

It is not a de Polignac number, because 1020155 - 2⁸ = 1019899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1592 + ... + 2138.

It is an arithmetic number, because the mean of its divisors is an integer number (153714).

2^1020155 is an apocalyptic number.

1020155 is a deficient number, since it is larger than the sum of its proper divisors (209557).

1020155 is an equidigital number, since it uses as much as digits as its factorization.

1020155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925.

The product of its (nonzero) digits is 50, while the sum is 14.

The square root of 1020155 is about 1010.0272273558. The cubic root of 1020155 is about 100.6673696036.

Adding to 1020155 its reverse (5510201), we get a palindrome (6530356).

The spelling of 1020155 in words is "one million, twenty thousand, one hundred fifty-five".