75443561 has 2 divisors, whose sum is σ = 75443562. Its totient is φ = 75443560.

The previous prime is 75443551. The next prime is 75443573. The reversal of 75443561 is 16534457.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60543961 + 14899600 = 7781^2 + 3860^2 .

It is an emirp because it is prime and its reverse (16534457) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75443561 - 2²² = 71249257 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (75443531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37721780 + 37721781.

It is an arithmetic number, because the mean of its divisors is an integer number (37721781).

Almost surely, 2^75443561 is an apocalyptic number.

It is an amenable number.

75443561 is a deficient number, since it is larger than the sum of its proper divisors (1).

75443561 is an equidigital number, since it uses as much as digits as its factorization.

75443561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 35.

The square root of 75443561 is about 8685.8252918188. The cubic root of 75443561 is about 422.5460631593.

The spelling of 75443561 in words is "seventy-five million, four hundred forty-three thousand, five hundred sixty-one".