75490861 has 2 divisors, whose sum is σ = 75490862. Its totient is φ = 75490860.

The previous prime is 75490837. The next prime is 75490867. The reversal of 75490861 is 16809457.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64561225 + 10929636 = 8035^2 + 3306^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75490861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75490867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37745430 + 37745431.

It is an arithmetic number, because the mean of its divisors is an integer number (37745431).

Almost surely, 2^75490861 is an apocalyptic number.

It is an amenable number.

75490861 is a deficient number, since it is larger than the sum of its proper divisors (1).

75490861 is an equidigital number, since it uses as much as digits as its factorization.

75490861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 75490861 is about 8688.5476922211. The cubic root of 75490861 is about 422.6343510268.

The spelling of 75490861 in words is "seventy-five million, four hundred ninety thousand, eight hundred sixty-one".