2551993 has 4 divisors (see below), whose sum is σ = 2555280. Its totient is φ = 2548708.

The previous prime is 2551987. The next prime is 2551999. The reversal of 2551993 is 3991552.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (2551987) and next prime (2551999).

It is a cyclic number.

It is not a de Polignac number, because 2551993 - 2⁵ = 2551961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2551999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246 + ... + 2272.

It is an arithmetic number, because the mean of its divisors is an integer number (638820).

2^2551993 is an apocalyptic number.

It is an amenable number.

2551993 is a deficient number, since it is larger than the sum of its proper divisors (3287).

2551993 is a wasteful number, since it uses less digits than its factorization.

2551993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3286.

The product of its digits is 12150, while the sum is 34.

The square root of 2551993 is about 1597.4958528898. The cubic root of 2551993 is about 136.6553040986.

The spelling of 2551993 in words is "two million, five hundred fifty-one thousand, nine hundred ninety-three".