537491221 has 4 divisors (see below), whose sum is σ = 538166412. Its totient is φ = 536816032.

The previous prime is 537491197. The next prime is 537491231. The reversal of 537491221 is 122194735.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 360468196 + 177023025 = 18986^2 + 13305^2 .

It is a cyclic number.

It is not a de Polignac number, because 537491221 - 2¹³ = 537483029 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 (537491231) 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, 336400 + ... + 337993.

It is an arithmetic number, because the mean of its divisors is an integer number (134541603).

Almost surely, 2^537491221 is an apocalyptic number.

It is an amenable number.

537491221 is a deficient number, since it is larger than the sum of its proper divisors (675191).

537491221 is an equidigital number, since it uses as much as digits as its factorization.

537491221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675190.

The product of its digits is 15120, while the sum is 34.

The square root of 537491221 is about 23183.8569051830. The cubic root of 537491221 is about 813.0622392032.

The spelling of 537491221 in words is "five hundred thirty-seven million, four hundred ninety-one thousand, two hundred twenty-one".