54139381 has 2 divisors, whose sum is σ = 54139382. Its totient is φ = 54139380.

The previous prime is 54139369. The next prime is 54139439. The reversal of 54139381 is 18393145.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43956900 + 10182481 = 6630^2 + 3191^2 .

It is a cyclic number.

It is not a de Polignac number, because 54139381 - 2¹⁷ = 54008309 is a prime.

It is a super-2 number, since 2×54139381² = 5862145150126322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54139301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27069690 + 27069691.

It is an arithmetic number, because the mean of its divisors is an integer number (27069691).

Almost surely, 2^54139381 is an apocalyptic number.

It is an amenable number.

54139381 is a deficient number, since it is larger than the sum of its proper divisors (1).

54139381 is an equidigital number, since it uses as much as digits as its factorization.

54139381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 34.

The square root of 54139381 is about 7357.9467924143. The cubic root of 54139381 is about 378.3012375281.

The spelling of 54139381 in words is "fifty-four million, one hundred thirty-nine thousand, three hundred eighty-one".