55426381 has 2 divisors, whose sum is σ = 55426382. Its totient is φ = 55426380.

The previous prime is 55426379. The next prime is 55426411. The reversal of 55426381 is 18362455.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30085225 + 25341156 = 5485^2 + 5034^2 .

It is a cyclic number.

It is not a de Polignac number, because 55426381 - 2¹ = 55426379 is a prime.

It is a super-2 number, since 2×55426381² = 6144167421514322, which contains 22 as substring.

Together with 55426379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55426351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27713190 + 27713191.

It is an arithmetic number, because the mean of its divisors is an integer number (27713191).

Almost surely, 2^55426381 is an apocalyptic number.

It is an amenable number.

55426381 is a deficient number, since it is larger than the sum of its proper divisors (1).

55426381 is an equidigital number, since it uses as much as digits as its factorization.

55426381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 34.

The square root of 55426381 is about 7444.8895895104. The cubic root of 55426381 is about 381.2754487715.

The spelling of 55426381 in words is "fifty-five million, four hundred twenty-six thousand, three hundred eighty-one".