53521091 has 4 divisors (see below), whose sum is σ = 57638112. Its totient is φ = 49404072.

The previous prime is 53521087. The next prime is 53521103. The reversal of 53521091 is 19012535.

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

It is a cyclic number.

It is not a de Polignac number, because 53521091 - 2² = 53521087 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 53521091.

It is not an unprimeable number, because it can be changed into a prime (53521001) 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, 2058491 + ... + 2058516.

It is an arithmetic number, because the mean of its divisors is an integer number (14409528).

Almost surely, 2^53521091 is an apocalyptic number.

53521091 is a deficient number, since it is larger than the sum of its proper divisors (4117021).

53521091 is a wasteful number, since it uses less digits than its factorization.

53521091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4117020.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 53521091 is about 7315.8110281773. The cubic root of 53521091 is about 376.8556110382.

The spelling of 53521091 in words is "fifty-three million, five hundred twenty-one thousand, ninety-one".