43553401 has 2 divisors, whose sum is σ = 43553402. Its totient is φ = 43553400.

The previous prime is 43553399. The next prime is 43553407. The reversal of 43553401 is 10435534.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42055225 + 1498176 = 6485^2 + 1224^2 .

It is a cyclic number.

It is not a de Polignac number, because 43553401 - 2¹ = 43553399 is a prime.

Together with 43553399, it forms a pair of twin primes.

It is the 6600-th Hogben number.

It is not a weakly prime, because it can be changed into another prime (43553407) by changing a digit.

It is a nontrivial repunit in base 6599.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21776700 + 21776701.

It is an arithmetic number, because the mean of its divisors is an integer number (21776701).

Almost surely, 2^43553401 is an apocalyptic number.

It is an amenable number.

43553401 is a deficient number, since it is larger than the sum of its proper divisors (1).

43553401 is an equidigital number, since it uses as much as digits as its factorization.

43553401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 43553401 is about 6599.5000568225. The cubic root of 43553401 is about 351.8363375921.

Adding to 43553401 its reverse (10435534), we get a palindrome (53988935).

The spelling of 43553401 in words is "forty-three million, five hundred fifty-three thousand, four hundred one".