53521491 has 16 divisors (see below), whose sum is σ = 76146048. Its totient is φ = 33321600.

The previous prime is 53521477. The next prime is 53521493. The reversal of 53521491 is 19412535.

It is a de Polignac number, because none of the positive numbers 2^k-53521491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53521493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2676 + ... + 10686.

It is an arithmetic number, because the mean of its divisors is an integer number (4759128).

Almost surely, 2^53521491 is an apocalyptic number.

53521491 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

53521491 is a deficient number, since it is larger than the sum of its proper divisors (22624557).

53521491 is a wasteful number, since it uses less digits than its factorization.

53521491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8162.

The product of its digits is 5400, while the sum is 30.

The square root of 53521491 is about 7315.8383661751. The cubic root of 53521491 is about 376.8565498697.

The spelling of 53521491 in words is "fifty-three million, five hundred twenty-one thousand, four hundred ninety-one".