52636991 has 4 divisors (see below), whose sum is σ = 57422184. Its totient is φ = 47851800.

The previous prime is 52636967. The next prime is 52636993. The reversal of 52636991 is 19963625.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52636991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52636993) 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, 2392580 + ... + 2392601.

It is an arithmetic number, because the mean of its divisors is an integer number (14355546).

Almost surely, 2^52636991 is an apocalyptic number.

52636991 is a deficient number, since it is larger than the sum of its proper divisors (4785193).

52636991 is a wasteful number, since it uses less digits than its factorization.

52636991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4785192.

The product of its digits is 87480, while the sum is 41.

The square root of 52636991 is about 7255.1354914984. The cubic root of 52636991 is about 374.7690216117.

The spelling of 52636991 in words is "fifty-two million, six hundred thirty-six thousand, nine hundred ninety-one".