53321591 has 8 divisors (see below), whose sum is σ = 55178640. Its totient is φ = 51492672.

The previous prime is 53321563. The next prime is 53321711. The reversal of 53321591 is 19512335.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-53321591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53321531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3140 + ... + 10793.

It is an arithmetic number, because the mean of its divisors is an integer number (6897330).

Almost surely, 2^53321591 is an apocalyptic number.

53321591 is a deficient number, since it is larger than the sum of its proper divisors (1857049).

53321591 is a wasteful number, since it uses less digits than its factorization.

53321591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14065.

The product of its digits is 4050, while the sum is 29.

The square root of 53321591 is about 7302.1634465410. The cubic root of 53321591 is about 376.3867846280.

It can be divided in two parts, 533 and 21591, that multiplied together give a triangular number (11508003 = T₄₇₉₇).

The spelling of 53321591 in words is "fifty-three million, three hundred twenty-one thousand, five hundred ninety-one".