43051381 has 2 divisors, whose sum is σ = 43051382. Its totient is φ = 43051380.

The previous prime is 43051367. The next prime is 43051409. The reversal of 43051381 is 18315034.

43051381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23328900 + 19722481 = 4830^2 + 4441^2 .

It is a cyclic number.

It is not a de Polignac number, because 43051381 - 2¹¹ = 43049333 is a prime.

It is a super-2 number, since 2×43051381² = 3706842812014322, which contains 22 as substring.

It is equal to p_2607415 and since 43051381 and 2607415 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43051301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21525690 + 21525691.

It is an arithmetic number, because the mean of its divisors is an integer number (21525691).

Almost surely, 2^43051381 is an apocalyptic number.

It is an amenable number.

43051381 is a deficient number, since it is larger than the sum of its proper divisors (1).

43051381 is an equidigital number, since it uses as much as digits as its factorization.

43051381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 43051381 is about 6561.3551191808. The cubic root of 43051381 is about 350.4792916555.

The spelling of 43051381 in words is "forty-three million, fifty-one thousand, three hundred eighty-one".