53609821 has 2 divisors, whose sum is σ = 53609822. Its totient is φ = 53609820.

The previous prime is 53609791. The next prime is 53609833. The reversal of 53609821 is 12890635.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31236921 + 22372900 = 5589^2 + 4730^2 .

It is a cyclic number.

It is not a de Polignac number, because 53609821 - 2¹⁵ = 53577053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53609861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26804910 + 26804911.

It is an arithmetic number, because the mean of its divisors is an integer number (26804911).

Almost surely, 2^53609821 is an apocalyptic number.

It is an amenable number.

53609821 is a deficient number, since it is larger than the sum of its proper divisors (1).

53609821 is an equidigital number, since it uses as much as digits as its factorization.

53609821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 53609821 is about 7321.8727795558. The cubic root of 53609821 is about 377.0637528885.

The spelling of 53609821 in words is "fifty-three million, six hundred nine thousand, eight hundred twenty-one".