2551551 has 8 divisors (see below), whose sum is σ = 3550080. Its totient is φ = 1627032.

The previous prime is 2551543. The next prime is 2551559. The reversal of 2551551 is 1551552.

It is an interprime number because it is at equal distance from previous prime (2551543) and next prime (2551559).

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

It is not a de Polignac number, because 2551551 - 2³ = 2551543 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2551559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18421 + ... + 18558.

It is an arithmetic number, because the mean of its divisors is an integer number (443760).

2^2551551 is an apocalyptic number.

2551551 is a deficient number, since it is larger than the sum of its proper divisors (998529).

2551551 is a wasteful number, since it uses less digits than its factorization.

2551551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37005.

The product of its digits is 1250, while the sum is 24.

The square root of 2551551 is about 1597.3575053819. The cubic root of 2551551 is about 136.6474141695.

Subtracting from 2551551 its reverse (1551552), we obtain a palindrome (999999).

The spelling of 2551551 in words is "two million, five hundred fifty-one thousand, five hundred fifty-one".