53521573 has 24 divisors (see below), whose sum is σ = 65265912. Its totient is φ = 43714944.

The previous prime is 53521553. The next prime is 53521607. The reversal of 53521573 is 37512535.

It can be written as a sum of positive squares in 4 ways, for example, as 11957764 + 41563809 = 3458^2 + 6447^2 .

It is not a de Polignac number, because 53521573 - 2¹⁷ = 53390501 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 (53521553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 95811 + ... + 96367.

It is an arithmetic number, because the mean of its divisors is an integer number (2719413).

Almost surely, 2^53521573 is an apocalyptic number.

53521573 is a gapful number since it is divisible by the number (53) formed by its first and last digit.

It is an amenable number.

53521573 is a deficient number, since it is larger than the sum of its proper divisors (11744339).

53521573 is a wasteful number, since it uses less digits than its factorization.

53521573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661 (or 654 counting only the distinct ones).

The product of its digits is 15750, while the sum is 31.

The square root of 53521573 is about 7315.8439704521. The cubic root of 53521573 is about 376.8567423296.

The spelling of 53521573 in words is "fifty-three million, five hundred twenty-one thousand, five hundred seventy-three".