52991139 has 4 divisors (see below), whose sum is σ = 70654856. Its totient is φ = 35327424.

The previous prime is 52991129. The next prime is 52991143. The reversal of 52991139 is 93119925.

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

It is not a de Polignac number, because 52991139 - 2⁴ = 52991123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 52991097 and 52991106.

It is not an unprimeable number, because it can be changed into a prime (52991129) 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, 8831854 + ... + 8831859.

It is an arithmetic number, because the mean of its divisors is an integer number (17663714).

Almost surely, 2^52991139 is an apocalyptic number.

52991139 is a deficient number, since it is larger than the sum of its proper divisors (17663717).

52991139 is a wasteful number, since it uses less digits than its factorization.

52991139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17663716.

The product of its digits is 21870, while the sum is 39.

The square root of 52991139 is about 7279.5012878631. The cubic root of 52991139 is about 375.6076406402.

The spelling of 52991139 in words is "fifty-two million, nine hundred ninety-one thousand, one hundred thirty-nine".