2551161 has 4 divisors (see below), whose sum is σ = 3401552. Its totient is φ = 1700772.

The previous prime is 2551127. The next prime is 2551169. The reversal of 2551161 is 1611552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2551161 - 2⁶ = 2551097 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2551169) 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, 425191 + ... + 425196.

It is an arithmetic number, because the mean of its divisors is an integer number (850388).

2^2551161 is an apocalyptic number.

It is an amenable number.

2551161 is a deficient number, since it is larger than the sum of its proper divisors (850391).

2551161 is an equidigital number, since it uses as much as digits as its factorization.

2551161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850390.

The product of its digits is 300, while the sum is 21.

The square root of 2551161 is about 1597.2354241000. The cubic root of 2551161 is about 136.6404517106.

The spelling of 2551161 in words is "two million, five hundred fifty-one thousand, one hundred sixty-one".