71238553 has 2 divisors, whose sum is σ = 71238554. Its totient is φ = 71238552.

The previous prime is 71238533. The next prime is 71238571. The reversal of 71238553 is 35583217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62220544 + 9018009 = 7888^2 + 3003^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71238553 is a prime.

It is not a weakly prime, because it can be changed into another prime (71238533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35619276 + 35619277.

It is an arithmetic number, because the mean of its divisors is an integer number (35619277).

Almost surely, 2^71238553 is an apocalyptic number.

It is an amenable number.

71238553 is a deficient number, since it is larger than the sum of its proper divisors (1).

71238553 is an equidigital number, since it uses as much as digits as its factorization.

71238553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 34.

The square root of 71238553 is about 8440.2934190702. The cubic root of 71238553 is about 414.5450144955.

The spelling of 71238553 in words is "seventy-one million, two hundred thirty-eight thousand, five hundred fifty-three".