71573669 has 2 divisors, whose sum is σ = 71573670. Its totient is φ = 71573668.

The previous prime is 71573647. The next prime is 71573693. The reversal of 71573669 is 96637517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70392100 + 1181569 = 8390^2 + 1087^2 .

It is a cyclic number.

It is not a de Polignac number, because 71573669 - 2²⁴ = 54796453 is a prime.

It is a super-2 number, since 2×71573669² = 10245580188243122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71570669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35786834 + 35786835.

It is an arithmetic number, because the mean of its divisors is an integer number (35786835).

Almost surely, 2^71573669 is an apocalyptic number.

It is an amenable number.

71573669 is a deficient number, since it is larger than the sum of its proper divisors (1).

71573669 is an equidigital number, since it uses as much as digits as its factorization.

71573669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 238140, while the sum is 44.

The square root of 71573669 is about 8460.1222804402. The cubic root of 71573669 is about 415.1940235632.

The spelling of 71573669 in words is "seventy-one million, five hundred seventy-three thousand, six hundred sixty-nine".