71057990281 has 2 divisors, whose sum is σ = 71057990282. Its totient is φ = 71057990280.

The previous prime is 71057990231. The next prime is 71057990293. The reversal of 71057990281 is 18209975017.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69849732681 + 1208257600 = 264291^2 + 34760^2 .

It is a cyclic number.

It is not a de Polignac number, because 71057990281 - 2¹⁷ = 71057859209 is a prime.

It is a super-2 number, since 2×71057990281² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71057990221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35528995140 + 35528995141.

It is an arithmetic number, because the mean of its divisors is an integer number (35528995141).

Almost surely, 2^71057990281 is an apocalyptic number.

It is an amenable number.

71057990281 is a deficient number, since it is larger than the sum of its proper divisors (1).

71057990281 is an equidigital number, since it uses as much as digits as its factorization.

71057990281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317520, while the sum is 49.

The spelling of 71057990281 in words is "seventy-one billion, fifty-seven million, nine hundred ninety thousand, two hundred eighty-one".