2201661251 has 4 divisors (see below), whose sum is σ = 2202198600. Its totient is φ = 2201123904.

The previous prime is 2201661247. The next prime is 2201661277. The reversal of 2201661251 is 1521661022.

2201661251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 2201661251 - 2² = 2201661247 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2201661251.

It is not an unprimeable number, because it can be changed into a prime (2201666251) 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, 262481 + ... + 270738.

It is an arithmetic number, because the mean of its divisors is an integer number (550549650).

Almost surely, 2^2201661251 is an apocalyptic number.

2201661251 is a deficient number, since it is larger than the sum of its proper divisors (537349).

2201661251 is an equidigital number, since it uses as much as digits as its factorization.

2201661251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537348.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 2201661251 is about 46921.8632515803. The cubic root of 2201661251 is about 1300.9187294626.

The spelling of 2201661251 in words is "two billion, two hundred one million, six hundred sixty-one thousand, two hundred fifty-one".