43190621 has 2 divisors, whose sum is σ = 43190622. Its totient is φ = 43190620.

The previous prime is 43190579. The next prime is 43190633. The reversal of 43190621 is 12609134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26265625 + 16924996 = 5125^2 + 4114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43190621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43190921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21595310 + 21595311.

It is an arithmetic number, because the mean of its divisors is an integer number (21595311).

Almost surely, 2^43190621 is an apocalyptic number.

It is an amenable number.

43190621 is a deficient number, since it is larger than the sum of its proper divisors (1).

43190621 is an equidigital number, since it uses as much as digits as its factorization.

43190621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 43190621 is about 6571.9571666285. The cubic root of 43190621 is about 350.8567338195.

Adding to 43190621 its reverse (12609134), we get a palindrome (55799755).

The spelling of 43190621 in words is "forty-three million, one hundred ninety thousand, six hundred twenty-one".