52499991 has 4 divisors (see below), whose sum is σ = 69999992. Its totient is φ = 34999992.

The previous prime is 52499977. The next prime is 52500013. The reversal of 52499991 is 19999425.

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

It is not a de Polignac number, because 52499991 - 2⁹ = 52499479 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 52499991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52499971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8749996 + ... + 8750001.

It is an arithmetic number, because the mean of its divisors is an integer number (17499998).

Almost surely, 2^52499991 is an apocalyptic number.

52499991 is a deficient number, since it is larger than the sum of its proper divisors (17500001).

52499991 is a wasteful number, since it uses less digits than its factorization.

52499991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17500000.

The product of its digits is 262440, while the sum is 48.

The square root of 52499991 is about 7245.6877520357. The cubic root of 52499991 is about 374.4435979641.

The spelling of 52499991 in words is "fifty-two million, four hundred ninety-nine thousand, nine hundred ninety-one".