55135681 has 2 divisors, whose sum is σ = 55135682. Its totient is φ = 55135680.

The previous prime is 55135667. The next prime is 55135697. The reversal of 55135681 is 18653155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27667600 + 27468081 = 5260^2 + 5241^2 .

It is a cyclic number.

It is not a de Polignac number, because 55135681 - 2¹¹ = 55133633 is a prime.

It is a super-2 number, since 2×55135681² = 6079886638667522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55135621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27567840 + 27567841.

It is an arithmetic number, because the mean of its divisors is an integer number (27567841).

Almost surely, 2^55135681 is an apocalyptic number.

It is an amenable number.

55135681 is a deficient number, since it is larger than the sum of its proper divisors (1).

55135681 is an equidigital number, since it uses as much as digits as its factorization.

55135681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18000, while the sum is 34.

The square root of 55135681 is about 7425.3404635747. The cubic root of 55135681 is about 380.6077095134.

The spelling of 55135681 in words is "fifty-five million, one hundred thirty-five thousand, six hundred eighty-one".