43552381 has 2 divisors, whose sum is σ = 43552382. Its totient is φ = 43552380.

The previous prime is 43552349. The next prime is 43552451. The reversal of 43552381 is 18325534.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39312900 + 4239481 = 6270^2 + 2059^2 .

It is a cyclic number.

It is not a de Polignac number, because 43552381 - 2⁵ = 43552349 is a prime.

It is a super-2 number, since 2×43552381² = 3793619781538322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43552781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21776190 + 21776191.

It is an arithmetic number, because the mean of its divisors is an integer number (21776191).

Almost surely, 2^43552381 is an apocalyptic number.

It is an amenable number.

43552381 is a deficient number, since it is larger than the sum of its proper divisors (1).

43552381 is an equidigital number, since it uses as much as digits as its factorization.

43552381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 31.

The square root of 43552381 is about 6599.4227777890. The cubic root of 43552381 is about 351.8335909572.

The spelling of 43552381 in words is "forty-three million, five hundred fifty-two thousand, three hundred eighty-one".