55441381 has 2 divisors, whose sum is σ = 55441382. Its totient is φ = 55441380.

The previous prime is 55441367. The next prime is 55441391. The reversal of 55441381 is 18314455.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55368481 + 72900 = 7441^2 + 270^2 .

It is a cyclic number.

It is not a de Polignac number, because 55441381 - 2²³ = 47052773 is a prime.

It is a super-2 number, since 2×55441381² = 6147493454374322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55441391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27720690 + 27720691.

It is an arithmetic number, because the mean of its divisors is an integer number (27720691).

Almost surely, 2^55441381 is an apocalyptic number.

It is an amenable number.

55441381 is a deficient number, since it is larger than the sum of its proper divisors (1).

55441381 is an equidigital number, since it uses as much as digits as its factorization.

55441381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9600, while the sum is 31.

The square root of 55441381 is about 7445.8969238098. The cubic root of 55441381 is about 381.3098404324.

The spelling of 55441381 in words is "fifty-five million, four hundred forty-one thousand, three hundred eighty-one".