75271997 has 2 divisors, whose sum is σ = 75271998. Its totient is φ = 75271996.

The previous prime is 75271991. The next prime is 75272009. The reversal of 75271997 is 79917257.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71808676 + 3463321 = 8474^2 + 1861^2 .

It is a cyclic number.

It is not a de Polignac number, because 75271997 - 2⁸ = 75271741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75271991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37635998 + 37635999.

It is an arithmetic number, because the mean of its divisors is an integer number (37635999).

Almost surely, 2^75271997 is an apocalyptic number.

It is an amenable number.

75271997 is a deficient number, since it is larger than the sum of its proper divisors (1).

75271997 is an equidigital number, since it uses as much as digits as its factorization.

75271997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 277830, while the sum is 47.

The square root of 75271997 is about 8675.9435798073. The cubic root of 75271997 is about 422.2255201676.

The spelling of 75271997 in words is "seventy-five million, two hundred seventy-one thousand, nine hundred ninety-seven".