52297991 has 4 divisors (see below), whose sum is σ = 54101400. Its totient is φ = 50494584.

The previous prime is 52297979. The next prime is 52297997. The reversal of 52297991 is 19979225.

It is a happy number.

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-52297991 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 (52297997) 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, 901661 + ... + 901718.

It is an arithmetic number, because the mean of its divisors is an integer number (13525350).

Almost surely, 2^52297991 is an apocalyptic number.

52297991 is a deficient number, since it is larger than the sum of its proper divisors (1803409).

52297991 is a wasteful number, since it uses less digits than its factorization.

52297991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1803408.

The product of its digits is 102060, while the sum is 44.

The square root of 52297991 is about 7231.7349923791. The cubic root of 52297991 is about 373.9627418631.

The spelling of 52297991 in words is "fifty-two million, two hundred ninety-seven thousand, nine hundred ninety-one".