71252981 has 2 divisors, whose sum is σ = 71252982. Its totient is φ = 71252980.

The previous prime is 71252977. The next prime is 71253019. The reversal of 71252981 is 18925217.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71250481 + 2500 = 8441^2 + 50^2 .

It is a cyclic number.

It is not a de Polignac number, because 71252981 - 2² = 71252977 is a prime.

It is a super-2 number, since 2×71252981² = 10153974602772722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71222981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35626490 + 35626491.

It is an arithmetic number, because the mean of its divisors is an integer number (35626491).

Almost surely, 2^71252981 is an apocalyptic number.

It is an amenable number.

71252981 is a deficient number, since it is larger than the sum of its proper divisors (1).

71252981 is an equidigital number, since it uses as much as digits as its factorization.

71252981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 35.

The square root of 71252981 is about 8441.1480854206. The cubic root of 71252981 is about 414.5729986487.

The spelling of 71252981 in words is "seventy-one million, two hundred fifty-two thousand, nine hundred eighty-one".