53821491 has 4 divisors (see below), whose sum is σ = 71761992. Its totient is φ = 35880992.

The previous prime is 53821489. The next prime is 53821501. The reversal of 53821491 is 19412835.

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 53821491 - 2¹ = 53821489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53821441) 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, 8970246 + ... + 8970251.

It is an arithmetic number, because the mean of its divisors is an integer number (17940498).

Almost surely, 2^53821491 is an apocalyptic number.

53821491 is a deficient number, since it is larger than the sum of its proper divisors (17940501).

53821491 is a wasteful number, since it uses less digits than its factorization.

53821491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17940500.

The product of its digits is 8640, while the sum is 33.

The square root of 53821491 is about 7336.3131748856. The cubic root of 53821491 is about 377.5593602836.

The spelling of 53821491 in words is "fifty-three million, eight hundred twenty-one thousand, four hundred ninety-one".