75271991 has 2 divisors, whose sum is σ = 75271992. Its totient is φ = 75271990.

The previous prime is 75271961. The next prime is 75271997. The reversal of 75271991 is 19917257.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 75271991 - 2¹⁰ = 75270967 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75271997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37635995 + 37635996.

It is an arithmetic number, because the mean of its divisors is an integer number (37635996).

Almost surely, 2^75271991 is an apocalyptic number.

75271991 is a deficient number, since it is larger than the sum of its proper divisors (1).

75271991 is an equidigital number, since it uses as much as digits as its factorization.

75271991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39690, while the sum is 41.

The square root of 75271991 is about 8675.9432340236. The cubic root of 75271991 is about 422.2255089490.

The spelling of 75271991 in words is "seventy-five million, two hundred seventy-one thousand, nine hundred ninety-one".