53816621 has 2 divisors, whose sum is σ = 53816622. Its totient is φ = 53816620.

The previous prime is 53816599. The next prime is 53816627. The reversal of 53816621 is 12661835.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30680521 + 23136100 = 5539^2 + 4810^2 .

It is a cyclic number.

It is not a de Polignac number, because 53816621 - 2⁶ = 53816557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53816627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26908310 + 26908311.

It is an arithmetic number, because the mean of its divisors is an integer number (26908311).

Almost surely, 2^53816621 is an apocalyptic number.

It is an amenable number.

53816621 is a deficient number, since it is larger than the sum of its proper divisors (1).

53816621 is an equidigital number, since it uses as much as digits as its factorization.

53816621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 32.

The square root of 53816621 is about 7335.9812567918. The cubic root of 53816621 is about 377.5479722085.

The spelling of 53816621 in words is "fifty-three million, eight hundred sixteen thousand, six hundred twenty-one".