102102155 has 16 divisors (see below), whose sum is σ = 125141760. Its totient is φ = 79948128.

The previous prime is 102102139. The next prime is 102102157. The reversal of 102102155 is 551201201.

It is a cyclic number.

It is not a de Polignac number, because 102102155 - 2⁴ = 102102139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (102102157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82874 + ... + 84096.

It is an arithmetic number, because the mean of its divisors is an integer number (7821360).

Almost surely, 2^102102155 is an apocalyptic number.

102102155 is a deficient number, since it is larger than the sum of its proper divisors (23039605).

102102155 is a wasteful number, since it uses less digits than its factorization.

102102155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1570.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 102102155 is about 10104.5610988306. The cubic root of 102102155 is about 467.3888017530.

Adding to 102102155 its reverse (551201201), we get a palindrome (653303356).

The spelling of 102102155 in words is "one hundred two million, one hundred two thousand, one hundred fifty-five".