53709661 has 2 divisors, whose sum is σ = 53709662. Its totient is φ = 53709660.

The previous prime is 53709629. The next prime is 53709683. The reversal of 53709661 is 16690735.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51696100 + 2013561 = 7190^2 + 1419^2 .

It is a cyclic number.

It is not a de Polignac number, because 53709661 - 2⁵ = 53709629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 53709661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53709611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26854830 + 26854831.

It is an arithmetic number, because the mean of its divisors is an integer number (26854831).

Almost surely, 2^53709661 is an apocalyptic number.

It is an amenable number.

53709661 is a deficient number, since it is larger than the sum of its proper divisors (1).

53709661 is an equidigital number, since it uses as much as digits as its factorization.

53709661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 53709661 is about 7328.6875359780. The cubic root of 53709661 is about 377.2976820365.

The spelling of 53709661 in words is "fifty-three million, seven hundred nine thousand, six hundred sixty-one".