12500155 has 16 divisors (see below), whose sum is σ = 15877440. Its totient is φ = 9427968.

The previous prime is 12500101. The next prime is 12500177. The reversal of 12500155 is 55100521.

It is a cyclic number.

It is not a de Polignac number, because 12500155 - 2¹⁷ = 12369083 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7651 + ... + 9139.

It is an arithmetic number, because the mean of its divisors is an integer number (992340).

Almost surely, 2^12500155 is an apocalyptic number.

12500155 is a deficient number, since it is larger than the sum of its proper divisors (3377285).

12500155 is a wasteful number, since it uses less digits than its factorization.

12500155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1590.

The product of its (nonzero) digits is 250, while the sum is 19.

The square root of 12500155 is about 3535.5558261750. Note that the first 3 decimals coincide. The cubic root of 12500155 is about 232.0804009384.

Adding to 12500155 its reverse (55100521), we get a palindrome (67600676).

The spelling of 12500155 in words is "twelve million, five hundred thousand, one hundred fifty-five".