2551403 has 2 divisors, whose sum is σ = 2551404. Its totient is φ = 2551402.

The previous prime is 2551397. The next prime is 2551421. The reversal of 2551403 is 3041552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2551403 - 2¹⁴ = 2535019 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (2551433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1275701 + 1275702.

It is an arithmetic number, because the mean of its divisors is an integer number (1275702).

2^2551403 is an apocalyptic number.

2551403 is a deficient number, since it is larger than the sum of its proper divisors (1).

2551403 is an equidigital number, since it uses as much as digits as its factorization.

2551403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 2551403 is about 1597.3111781992. The cubic root of 2551403 is about 136.6447720891.

Adding to 2551403 its reverse (3041552), we get a palindrome (5592955).

The spelling of 2551403 in words is "two million, five hundred fifty-one thousand, four hundred three".