12155577 has 16 divisors (see below), whose sum is σ = 18902400. Its totient is φ = 6945456.

The previous prime is 12155567. The next prime is 12155579. The reversal of 12155577 is 77555121.

It is not a de Polignac number, because 12155577 - 2¹⁰ = 12154553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12155579) 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, 4878 + ... + 6935.

It is an arithmetic number, because the mean of its divisors is an integer number (1181400).

Almost surely, 2^12155577 is an apocalyptic number.

It is an amenable number.

12155577 is a deficient number, since it is larger than the sum of its proper divisors (6746823).

12155577 is an equidigital number, since it uses as much as digits as its factorization.

12155577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11837 (or 11823 counting only the distinct ones).

The product of its digits is 12250, while the sum is 33.

The square root of 12155577 is about 3486.4849060336. The cubic root of 12155577 is about 229.9279988866.

The spelling of 12155577 in words is "twelve million, one hundred fifty-five thousand, five hundred seventy-seven".