75164581 has 2 divisors, whose sum is σ = 75164582. Its totient is φ = 75164580.

The previous prime is 75164567. The next prime is 75164587. The reversal of 75164581 is 18546157.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75099556 + 65025 = 8666^2 + 255^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75164581 is a prime.

It is a super-2 number, since 2×75164581² = 11299428473811122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 75164581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75164587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37582290 + 37582291.

It is an arithmetic number, because the mean of its divisors is an integer number (37582291).

Almost surely, 2^75164581 is an apocalyptic number.

It is an amenable number.

75164581 is a deficient number, since it is larger than the sum of its proper divisors (1).

75164581 is an equidigital number, since it uses as much as digits as its factorization.

75164581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33600, while the sum is 37.

The square root of 75164581 is about 8669.7509191441. The cubic root of 75164581 is about 422.0245806007.

The spelling of 75164581 in words is "seventy-five million, one hundred sixty-four thousand, five hundred eighty-one".