43040251 has 2 divisors, whose sum is σ = 43040252. Its totient is φ = 43040250.

The previous prime is 43040233. The next prime is 43040299. The reversal of 43040251 is 15204034.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43040251 - 2⁵ = 43040219 is a prime.

It is a super-2 number, since 2×43040251² = 3704926412286002, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43040951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21520125 + 21520126.

It is an arithmetic number, because the mean of its divisors is an integer number (21520126).

Almost surely, 2^43040251 is an apocalyptic number.

43040251 is a deficient number, since it is larger than the sum of its proper divisors (1).

43040251 is an equidigital number, since it uses as much as digits as its factorization.

43040251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 43040251 is about 6560.5069163899. The cubic root of 43040251 is about 350.4490861148.

Adding to 43040251 its reverse (15204034), we get a palindrome (58244285).

The spelling of 43040251 in words is "forty-three million, forty thousand, two hundred fifty-one".