2511891 has 12 divisors (see below), whose sum is σ = 3763032. Its totient is φ = 1674432.

The previous prime is 2511881. The next prime is 2511911. The reversal of 2511891 is 1981152.

It is not a de Polignac number, because 2511891 - 2⁶ = 2511827 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (2511811) 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, 4926 + ... + 5411.

It is an arithmetic number, because the mean of its divisors is an integer number (313586).

2^2511891 is an apocalyptic number.

2511891 is a deficient number, since it is larger than the sum of its proper divisors (1251141).

2511891 is an equidigital number, since it uses as much as digits as its factorization.

2511891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10352 (or 10340 counting only the distinct ones).

The product of its digits is 720, while the sum is 27.

The square root of 2511891 is about 1584.8946337217. The cubic root of 2511891 is about 135.9357214987.

The spelling of 2511891 in words is "two million, five hundred eleven thousand, eight hundred ninety-one".