53487881 has 2 divisors, whose sum is σ = 53487882. Its totient is φ = 53487880.

The previous prime is 53487839. The next prime is 53487887. The reversal of 53487881 is 18878435.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49843600 + 3644281 = 7060^2 + 1909^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53487881 is a prime.

It is a super-2 number, since 2×53487881² = 5721906827740322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (53487887) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26743940 + 26743941.

It is an arithmetic number, because the mean of its divisors is an integer number (26743941).

Almost surely, 2^53487881 is an apocalyptic number.

It is an amenable number.

53487881 is a deficient number, since it is larger than the sum of its proper divisors (1).

53487881 is an equidigital number, since it uses as much as digits as its factorization.

53487881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 215040, while the sum is 44.

The square root of 53487881 is about 7313.5409344585. The cubic root of 53487881 is about 376.7776482257. Note that the first 3 decimals are identical.

The spelling of 53487881 in words is "fifty-three million, four hundred eighty-seven thousand, eight hundred eighty-one".