75781213 has 2 divisors, whose sum is σ = 75781214. Its totient is φ = 75781212.

The previous prime is 75781201. The next prime is 75781219. The reversal of 75781213 is 31218757.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41242084 + 34539129 = 6422^2 + 5877^2 .

It is an emirp because it is prime and its reverse (31218757) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75781213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75781219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37890606 + 37890607.

It is an arithmetic number, because the mean of its divisors is an integer number (37890607).

Almost surely, 2^75781213 is an apocalyptic number.

It is an amenable number.

75781213 is a deficient number, since it is larger than the sum of its proper divisors (1).

75781213 is an equidigital number, since it uses as much as digits as its factorization.

75781213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11760, while the sum is 34.

The square root of 75781213 is about 8705.2405480837. The cubic root of 75781213 is about 423.1755014716.

The spelling of 75781213 in words is "seventy-five million, seven hundred eighty-one thousand, two hundred thirteen".