71533531 has 2 divisors, whose sum is σ = 71533532. Its totient is φ = 71533530.

The previous prime is 71533513. The next prime is 71533549. The reversal of 71533531 is 13533517.

Together with previous prime (71533513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (71533513) and next prime (71533549).

It is a cyclic number.

It is not a de Polignac number, because 71533531 - 2¹¹ = 71531483 is a prime.

It is a super-2 number, since 2×71533531² = 10234092114655922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71533531.

It is not a weakly prime, because it can be changed into another prime (71530531) 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, 35766765 + 35766766.

It is an arithmetic number, because the mean of its divisors is an integer number (35766766).

Almost surely, 2^71533531 is an apocalyptic number.

71533531 is a deficient number, since it is larger than the sum of its proper divisors (1).

71533531 is an equidigital number, since it uses as much as digits as its factorization.

71533531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4725, while the sum is 28.

The square root of 71533531 is about 8457.7497598357. The cubic root of 71533531 is about 415.1163964407.

The spelling of 71533531 in words is "seventy-one million, five hundred thirty-three thousand, five hundred thirty-one".