2451881 has 2 divisors, whose sum is σ = 2451882. Its totient is φ = 2451880.

The previous prime is 2451871. The next prime is 2451887. The reversal of 2451881 is 1881542.

2451881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2418025 + 33856 = 1555^2 + 184^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2451881 is a prime.

It is a super-2 number, since 2×2451881² = 12023440876322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2451887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1225940 + 1225941.

It is an arithmetic number, because the mean of its divisors is an integer number (1225941).

2^2451881 is an apocalyptic number.

It is an amenable number.

2451881 is a deficient number, since it is larger than the sum of its proper divisors (1).

2451881 is an equidigital number, since it uses as much as digits as its factorization.

2451881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2560, while the sum is 29.

The square root of 2451881 is about 1565.8483323745. The cubic root of 2451881 is about 134.8444665120.

The spelling of 2451881 in words is "two million, four hundred fifty-one thousand, eight hundred eighty-one".