75391891 has 2 divisors, whose sum is σ = 75391892. Its totient is φ = 75391890.

The previous prime is 75391873. The next prime is 75391949. The reversal of 75391891 is 19819357.

It is a weak prime.

It is an emirp because it is prime and its reverse (19819357) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75391891 - 2⁵ = 75391859 is a prime.

It is not a weakly prime, because it can be changed into another prime (75391091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37695945 + 37695946.

It is an arithmetic number, because the mean of its divisors is an integer number (37695946).

Almost surely, 2^75391891 is an apocalyptic number.

75391891 is a deficient number, since it is larger than the sum of its proper divisors (1).

75391891 is an equidigital number, since it uses as much as digits as its factorization.

75391891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 43.

The square root of 75391891 is about 8682.8503960393. The cubic root of 75391891 is about 422.4495762799.

The spelling of 75391891 in words is "seventy-five million, three hundred ninety-one thousand, eight hundred ninety-one".