55241781 has 16 divisors (see below), whose sum is σ = 87081600. Its totient is φ = 30477888.

The previous prime is 55241731. The next prime is 55241819. The reversal of 55241781 is 18714255.

It is not a de Polignac number, because 55241781 - 2⁶ = 55241717 is a prime.

It is a super-2 number, since 2×55241781² = 6103308736103922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55241731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44746 + ... + 45963.

It is an arithmetic number, because the mean of its divisors is an integer number (5442600).

Almost surely, 2^55241781 is an apocalyptic number.

It is an amenable number.

55241781 is a deficient number, since it is larger than the sum of its proper divisors (31839819).

55241781 is a wasteful number, since it uses less digits than its factorization.

55241781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90748.

The product of its digits is 11200, while the sum is 33.

The square root of 55241781 is about 7432.4814833271. The cubic root of 55241781 is about 380.8516930926.

The spelling of 55241781 in words is "fifty-five million, two hundred forty-one thousand, seven hundred eighty-one".