75221687 has 2 divisors, whose sum is σ = 75221688. Its totient is φ = 75221686.

The previous prime is 75221659. The next prime is 75221701. The reversal of 75221687 is 78612257.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 75221687 - 2⁶ = 75221623 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 75221687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75221647) 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, 37610843 + 37610844.

It is an arithmetic number, because the mean of its divisors is an integer number (37610844).

Almost surely, 2^75221687 is an apocalyptic number.

75221687 is a deficient number, since it is larger than the sum of its proper divisors (1).

75221687 is an equidigital number, since it uses as much as digits as its factorization.

75221687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47040, while the sum is 38.

The square root of 75221687 is about 8673.0436987254. The cubic root of 75221687 is about 422.1314307271.

The spelling of 75221687 in words is "seventy-five million, two hundred twenty-one thousand, six hundred eighty-seven".