55235681 has 4 divisors (see below), whose sum is σ = 55633200. Its totient is φ = 54838164.

The previous prime is 55235639. The next prime is 55235689. The reversal of 55235681 is 18653255.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18653255 = 5 ⋅3730651.

It is a cyclic number.

It is not a de Polignac number, because 55235681 - 2⁶ = 55235617 is a prime.

It is a super-2 number, since 2×55235681² = 6101960911067522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55235689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198551 + ... + 198828.

It is an arithmetic number, because the mean of its divisors is an integer number (13908300).

Almost surely, 2^55235681 is an apocalyptic number.

It is an amenable number.

55235681 is a deficient number, since it is larger than the sum of its proper divisors (397519).

55235681 is a wasteful number, since it uses less digits than its factorization.

55235681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397518.

The product of its digits is 36000, while the sum is 35.

The square root of 55235681 is about 7432.0711110699. The cubic root of 55235681 is about 380.8376742298.

The spelling of 55235681 in words is "fifty-five million, two hundred thirty-five thousand, six hundred eighty-one".