43250981 has 2 divisors, whose sum is σ = 43250982. Its totient is φ = 43250980.

The previous prime is 43250969. The next prime is 43250989. The reversal of 43250981 is 18905234.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40132225 + 3118756 = 6335^2 + 1766^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43250981 is a prime.

It is a super-2 number, since 2×43250981² = 3741294714924722, which contains 22 as substring.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43250989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21625490 + 21625491.

It is an arithmetic number, because the mean of its divisors is an integer number (21625491).

Almost surely, 2^43250981 is an apocalyptic number.

It is an amenable number.

43250981 is a deficient number, since it is larger than the sum of its proper divisors (1).

43250981 is an equidigital number, since it uses as much as digits as its factorization.

43250981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 43250981 is about 6576.5478026089. The cubic root of 43250981 is about 351.0201014995.

The spelling of 43250981 in words is "forty-three million, two hundred fifty thousand, nine hundred eighty-one".