53987561 has 2 divisors, whose sum is σ = 53987562. Its totient is φ = 53987560.

The previous prime is 53987543. The next prime is 53987567. The reversal of 53987561 is 16578935.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47955625 + 6031936 = 6925^2 + 2456^2 .

It is a cyclic number.

It is not a de Polignac number, because 53987561 - 2¹⁸ = 53725417 is a prime.

It is not a weakly prime, because it can be changed into another prime (53987567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26993780 + 26993781.

It is an arithmetic number, because the mean of its divisors is an integer number (26993781).

Almost surely, 2^53987561 is an apocalyptic number.

It is an amenable number.

53987561 is a deficient number, since it is larger than the sum of its proper divisors (1).

53987561 is an equidigital number, since it uses as much as digits as its factorization.

53987561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 44.

The square root of 53987561 is about 7347.6228128559. The cubic root of 53987561 is about 377.9472902250.

The spelling of 53987561 in words is "fifty-three million, nine hundred eighty-seven thousand, five hundred sixty-one".