53087261 has 4 divisors (see below), whose sum is σ = 53102400. Its totient is φ = 53072124.

The previous prime is 53087257. The next prime is 53087269. The reversal of 53087261 is 16278035.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 53087261 - 2² = 53087257 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 (53087269) 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, 710 + ... + 10328.

It is an arithmetic number, because the mean of its divisors is an integer number (13275600).

Almost surely, 2^53087261 is an apocalyptic number.

It is an amenable number.

53087261 is a deficient number, since it is larger than the sum of its proper divisors (15139).

53087261 is an equidigital number, since it uses as much as digits as its factorization.

53087261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15138.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 53087261 is about 7286.1005345795. The cubic root of 53087261 is about 375.8346116030.

The spelling of 53087261 in words is "fifty-three million, eighty-seven thousand, two hundred sixty-one".