53969681 has 2 divisors, whose sum is σ = 53969682. Its totient is φ = 53969680.

The previous prime is 53969647. The next prime is 53969693. The reversal of 53969681 is 18696935.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52432081 + 1537600 = 7241^2 + 1240^2 .

It is a cyclic number.

It is not a de Polignac number, because 53969681 - 2²² = 49775377 is a prime.

It is a super-2 number, since 2×53969681² = 5825452934483522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (53969621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26984840 + 26984841.

It is an arithmetic number, because the mean of its divisors is an integer number (26984841).

Almost surely, 2^53969681 is an apocalyptic number.

It is an amenable number.

53969681 is a deficient number, since it is larger than the sum of its proper divisors (1).

53969681 is an equidigital number, since it uses as much as digits as its factorization.

53969681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 47.

The square root of 53969681 is about 7346.4059920481. The cubic root of 53969681 is about 377.9055618245.

The spelling of 53969681 in words is "fifty-three million, nine hundred sixty-nine thousand, six hundred eighty-one".