53099521 has 4 divisors (see below), whose sum is σ = 53142192. Its totient is φ = 53056852.

The previous prime is 53099513. The next prime is 53099531. The reversal of 53099521 is 12599035.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 53099521 - 2³ = 53099513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53099531) 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, 19411 + ... + 21976.

It is an arithmetic number, because the mean of its divisors is an integer number (13285548).

Almost surely, 2^53099521 is an apocalyptic number.

It is an amenable number.

53099521 is a deficient number, since it is larger than the sum of its proper divisors (42671).

53099521 is a wasteful number, since it uses less digits than its factorization.

53099521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42670.

The product of its (nonzero) digits is 12150, while the sum is 34.

The square root of 53099521 is about 7286.9418139573. The cubic root of 53099521 is about 375.8635411905.

The spelling of 53099521 in words is "fifty-three million, ninety-nine thousand, five hundred twenty-one".