54781421 has 2 divisors, whose sum is σ = 54781422. Its totient is φ = 54781420.

The previous prime is 54781409. The next prime is 54781439. The reversal of 54781421 is 12418745.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29278921 + 25502500 = 5411^2 + 5050^2 .

It is a cyclic number.

It is not a de Polignac number, because 54781421 - 2¹⁸ = 54519277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54781451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27390710 + 27390711.

It is an arithmetic number, because the mean of its divisors is an integer number (27390711).

Almost surely, 2^54781421 is an apocalyptic number.

It is an amenable number.

54781421 is a deficient number, since it is larger than the sum of its proper divisors (1).

54781421 is an equidigital number, since it uses as much as digits as its factorization.

54781421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8960, while the sum is 32.

The square root of 54781421 is about 7401.4472233476. The cubic root of 54781421 is about 379.7907920445.

The spelling of 54781421 in words is "fifty-four million, seven hundred eighty-one thousand, four hundred twenty-one".