2451891 has 8 divisors (see below), whose sum is σ = 3520720. Its totient is φ = 1508832.

The previous prime is 2451887. The next prime is 2451907. The reversal of 2451891 is 1981542.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2451891 - 2² = 2451887 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2451811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31396 + ... + 31473.

It is an arithmetic number, because the mean of its divisors is an integer number (440090).

2^2451891 is an apocalyptic number.

2451891 is a deficient number, since it is larger than the sum of its proper divisors (1068829).

2451891 is a wasteful number, since it uses less digits than its factorization.

2451891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62885.

The product of its digits is 2880, while the sum is 30.

The square root of 2451891 is about 1565.8515255285. The cubic root of 2451891 is about 134.8446498328.

It can be divided in two parts, 24 and 51891, that added together give a palindrome (51915).

The spelling of 2451891 in words is "two million, four hundred fifty-one thousand, eight hundred ninety-one".