53405621 has 2 divisors, whose sum is σ = 53405622. Its totient is φ = 53405620.

The previous prime is 53405587. The next prime is 53405629. The reversal of 53405621 is 12650435.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51122500 + 2283121 = 7150^2 + 1511^2 .

It is a cyclic number.

It is not a de Polignac number, because 53405621 - 2⁶ = 53405557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53405629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26702810 + 26702811.

It is an arithmetic number, because the mean of its divisors is an integer number (26702811).

Almost surely, 2^53405621 is an apocalyptic number.

It is an amenable number.

53405621 is a deficient number, since it is larger than the sum of its proper divisors (1).

53405621 is an equidigital number, since it uses as much as digits as its factorization.

53405621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 53405621 is about 7307.9149557175. The cubic root of 53405621 is about 376.5843980229.

The spelling of 53405621 in words is "fifty-three million, four hundred five thousand, six hundred twenty-one".