12811550 has 24 divisors (see below), whose sum is σ = 24105600. Its totient is φ = 5065280.

The previous prime is 12811543. The next prime is 12811553. The reversal of 12811550 is 5511821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12811553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3011 + ... + 5889.

It is an arithmetic number, because the mean of its divisors is an integer number (1004400).

Almost surely, 2^12811550 is an apocalyptic number.

12811550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12811550 is a deficient number, since it is larger than the sum of its proper divisors (11294050).

12811550 is a wasteful number, since it uses less digits than its factorization.

12811550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2980 (or 2975 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 12811550 is about 3579.3225616030. The cubic root of 12811550 is about 233.9917570817.

The spelling of 12811550 in words is "twelve million, eight hundred eleven thousand, five hundred fifty".