12811901 has 4 divisors (see below), whose sum is σ = 12831612. Its totient is φ = 12792192.

The previous prime is 12811889. The next prime is 12811907. The reversal of 12811901 is 10911821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1428025 + 11383876 = 1195^2 + 3374^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12811901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12811907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8846 + ... + 10191.

It is an arithmetic number, because the mean of its divisors is an integer number (3207903).

Almost surely, 2^12811901 is an apocalyptic number.

It is an amenable number.

12811901 is a deficient number, since it is larger than the sum of its proper divisors (19711).

12811901 is an equidigital number, since it uses as much as digits as its factorization.

12811901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19710.

The product of its (nonzero) digits is 144, while the sum is 23.

The square root of 12811901 is about 3579.3715928917. The cubic root of 12811901 is about 233.9938939649.

The spelling of 12811901 in words is "twelve million, eight hundred eleven thousand, nine hundred one".