2451993 has 4 divisors (see below), whose sum is σ = 3269328. Its totient is φ = 1634660.

The previous prime is 2451991. The next prime is 2452003. The reversal of 2451993 is 3991542.

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.

It is a cyclic number.

It is not a de Polignac number, because 2451993 - 2¹ = 2451991 is a prime.

It is a D-number.

2451993 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2451991) 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, 408663 + ... + 408668.

It is an arithmetic number, because the mean of its divisors is an integer number (817332).

2^2451993 is an apocalyptic number.

It is an amenable number.

2451993 is a deficient number, since it is larger than the sum of its proper divisors (817335).

2451993 is an equidigital number, since it uses as much as digits as its factorization.

2451993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817334.

The product of its digits is 9720, while the sum is 33.

The square root of 2451993 is about 1565.8840953276. The cubic root of 2451993 is about 134.8465196772.

The spelling of 2451993 in words is "two million, four hundred fifty-one thousand, nine hundred ninety-three".