71164421 has 2 divisors, whose sum is σ = 71164422. Its totient is φ = 71164420.

The previous prime is 71164411. The next prime is 71164427. The reversal of 71164421 is 12446117.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61622500 + 9541921 = 7850^2 + 3089^2 .

It is a cyclic number.

It is not a de Polignac number, because 71164421 - 2¹⁸ = 70902277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71164427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35582210 + 35582211.

It is an arithmetic number, because the mean of its divisors is an integer number (35582211).

Almost surely, 2^71164421 is an apocalyptic number.

It is an amenable number.

71164421 is a deficient number, since it is larger than the sum of its proper divisors (1).

71164421 is an equidigital number, since it uses as much as digits as its factorization.

71164421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 26.

The square root of 71164421 is about 8435.9007225073. The cubic root of 71164421 is about 414.4011704877.

The spelling of 71164421 in words is "seventy-one million, one hundred sixty-four thousand, four hundred twenty-one".