43087381 has 2 divisors, whose sum is σ = 43087382. Its totient is φ = 43087380.

The previous prime is 43087361. The next prime is 43087393. The reversal of 43087381 is 18378034.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42380100 + 707281 = 6510^2 + 841^2 .

It is a cyclic number.

It is not a de Polignac number, because 43087381 - 2¹¹ = 43085333 is a prime.

It is a super-2 number, since 2×43087381² = 3713044802878322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43087321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21543690 + 21543691.

It is an arithmetic number, because the mean of its divisors is an integer number (21543691).

Almost surely, 2^43087381 is an apocalyptic number.

43087381 is the 4152-nd centered pentagonal number.

It is an amenable number.

43087381 is a deficient number, since it is larger than the sum of its proper divisors (1).

43087381 is an equidigital number, since it uses as much as digits as its factorization.

43087381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 43087381 is about 6564.0978816590. The cubic root of 43087381 is about 350.5769558801.

The spelling of 43087381 in words is "forty-three million, eighty-seven thousand, three hundred eighty-one".