24991993 has 4 divisors (see below), whose sum is σ = 26914468. Its totient is φ = 23069520.

The previous prime is 24991979. The next prime is 24992039. The reversal of 24991993 is 39919942.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12089529 + 12902464 = 3477^2 + 3592^2 .

It is a cyclic number.

It is not a de Polignac number, because 24991993 - 2¹⁷ = 24860921 is a prime.

It is a super-2 number, since 2×24991993² = 1249199428224098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (24991903) 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, 961218 + ... + 961243.

It is an arithmetic number, because the mean of its divisors is an integer number (6728617).

Almost surely, 2^24991993 is an apocalyptic number.

It is an amenable number.

24991993 is a deficient number, since it is larger than the sum of its proper divisors (1922475).

24991993 is a wasteful number, since it uses less digits than its factorization.

24991993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1922474.

The product of its digits is 157464, while the sum is 46.

The square root of 24991993 is about 4999.1992358777. The cubic root of 24991993 is about 292.3705536746.

The spelling of 24991993 in words is "twenty-four million, nine hundred ninety-one thousand, nine hundred ninety-three".