71990273 has 2 divisors, whose sum is σ = 71990274. Its totient is φ = 71990272.

The previous prime is 71990203. The next prime is 71990287. The reversal of 71990273 is 37209917.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64770304 + 7219969 = 8048^2 + 2687^2 .

It is an emirp because it is prime and its reverse (37209917) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71990273 is a prime.

It is a super-2 number, since 2×71990273² = 10365198813229058, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (71990203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35995136 + 35995137.

It is an arithmetic number, because the mean of its divisors is an integer number (35995137).

Almost surely, 2^71990273 is an apocalyptic number.

It is an amenable number.

71990273 is a deficient number, since it is larger than the sum of its proper divisors (1).

71990273 is an equidigital number, since it uses as much as digits as its factorization.

71990273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 71990273 is about 8484.7081859072. The cubic root of 71990273 is about 415.9980295302.

The spelling of 71990273 in words is "seventy-one million, nine hundred ninety thousand, two hundred seventy-three".