2551381 has 6 divisors (see below), whose sum is σ = 2967990. Its totient is φ = 2186856.

The previous prime is 2551369. The next prime is 2551397. The reversal of 2551381 is 1831552.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2480625 + 70756 = 1575^2 + 266^2 .

It is not a de Polignac number, because 2551381 - 2⁵ = 2551349 is a prime.

It is a super-2 number, since 2×2551381² = 13019090014322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2551481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25986 + ... + 26083.

It is an arithmetic number, because the mean of its divisors is an integer number (494665).

2^2551381 is an apocalyptic number.

It is an amenable number.

2551381 is a deficient number, since it is larger than the sum of its proper divisors (416609).

2551381 is an equidigital number, since it uses as much as digits as its factorization.

2551381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52083 (or 52076 counting only the distinct ones).

The product of its digits is 1200, while the sum is 25.

The square root of 2551381 is about 1597.3042916113. The cubic root of 2551381 is about 136.6443793387.

The spelling of 2551381 in words is "two million, five hundred fifty-one thousand, three hundred eighty-one".