71641993 has 2 divisors, whose sum is σ = 71641994. Its totient is φ = 71641992.

The previous prime is 71641949. The next prime is 71642009. The reversal of 71641993 is 39914617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51093904 + 20548089 = 7148^2 + 4533^2 .

It is a cyclic number.

It is not a de Polignac number, because 71641993 - 2¹⁷ = 71510921 is a prime.

It is a super-2 number, since 2×71641993² = 10265150322024098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71641943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35820996 + 35820997.

It is an arithmetic number, because the mean of its divisors is an integer number (35820997).

Almost surely, 2^71641993 is an apocalyptic number.

It is an amenable number.

71641993 is a deficient number, since it is larger than the sum of its proper divisors (1).

71641993 is an equidigital number, since it uses as much as digits as its factorization.

71641993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 40.

The square root of 71641993 is about 8464.1593203342. The cubic root of 71641993 is about 415.3260958511.

The spelling of 71641993 in words is "seventy-one million, six hundred forty-one thousand, nine hundred ninety-three".