53661697 has 2 divisors, whose sum is σ = 53661698. Its totient is φ = 53661696.

The previous prime is 53661683. The next prime is 53661703. The reversal of 53661697 is 79616635.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50112241 + 3549456 = 7079^2 + 1884^2 .

It is a cyclic number.

It is not a de Polignac number, because 53661697 - 2¹¹ = 53659649 is a prime.

It is not a weakly prime, because it can be changed into another prime (53661607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26830848 + 26830849.

It is an arithmetic number, because the mean of its divisors is an integer number (26830849).

Almost surely, 2^53661697 is an apocalyptic number.

It is an amenable number.

53661697 is a deficient number, since it is larger than the sum of its proper divisors (1).

53661697 is an equidigital number, since it uses as much as digits as its factorization.

53661697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 43.

The square root of 53661697 is about 7325.4144592644. The cubic root of 53661697 is about 377.1853366640.

The spelling of 53661697 in words is "fifty-three million, six hundred sixty-one thousand, six hundred ninety-seven".