54640381 has 2 divisors, whose sum is σ = 54640382. Its totient is φ = 54640380.

The previous prime is 54640373. The next prime is 54640451. The reversal of 54640381 is 18304645.

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., 50268100 + 4372281 = 7090^2 + 2091^2 .

It is a cyclic number.

It is not a de Polignac number, because 54640381 - 2³ = 54640373 is a prime.

It is a super-2 number, since 2×54640381² = 5971142471650322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54640351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27320190 + 27320191.

It is an arithmetic number, because the mean of its divisors is an integer number (27320191).

Almost surely, 2^54640381 is an apocalyptic number.

It is an amenable number.

54640381 is a deficient number, since it is larger than the sum of its proper divisors (1).

54640381 is an equidigital number, since it uses as much as digits as its factorization.

54640381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 54640381 is about 7391.9132164819. The cubic root of 54640381 is about 379.4645760380.

The spelling of 54640381 in words is "fifty-four million, six hundred forty thousand, three hundred eighty-one".