75021691 has 2 divisors, whose sum is σ = 75021692. Its totient is φ = 75021690.

The previous prime is 75021619. The next prime is 75021701. The reversal of 75021691 is 19612057.

Together with previous prime (75021619) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 75021691 - 2¹⁹ = 74497403 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (75021601) 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, 37510845 + 37510846.

It is an arithmetic number, because the mean of its divisors is an integer number (37510846).

Almost surely, 2^75021691 is an apocalyptic number.

75021691 is a deficient number, since it is larger than the sum of its proper divisors (1).

75021691 is an equidigital number, since it uses as much as digits as its factorization.

75021691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 75021691 is about 8661.5062777787. The cubic root of 75021691 is about 421.7569840609.

The spelling of 75021691 in words is "seventy-five million, twenty-one thousand, six hundred ninety-one".