1020002155 has 8 divisors (see below), whose sum is σ = 1232809200. Its totient is φ = 810130656.

The previous prime is 1020002143. The next prime is 1020002173. The reversal of 1020002155 is 5512000201.

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 1020002155 - 2¹⁹ = 1019477867 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 733120 + ... + 734509.

It is an arithmetic number, because the mean of its divisors is an integer number (154101150).

Almost surely, 2^1020002155 is an apocalyptic number.

1020002155 is a deficient number, since it is larger than the sum of its proper divisors (212807045).

1020002155 is a wasteful number, since it uses less digits than its factorization.

1020002155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1467773.

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

The square root of 1020002155 is about 31937.4725831585. The cubic root of 1020002155 is about 1006.6234184720.

Adding to 1020002155 its reverse (5512000201), we get a palindrome (6532002356).

The spelling of 1020002155 in words is "one billion, twenty million, two thousand, one hundred fifty-five".