71123531 has 2 divisors, whose sum is σ = 71123532. Its totient is φ = 71123530.

The previous prime is 71123491. The next prime is 71123537. The reversal of 71123531 is 13532117.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71123531 - 2⁶ = 71123467 is a prime.

It is a super-2 number, since 2×71123531² = 10117113323815922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 71123497 and 71123506.

It is not a weakly prime, because it can be changed into another prime (71123537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35561765 + 35561766.

It is an arithmetic number, because the mean of its divisors is an integer number (35561766).

Almost surely, 2^71123531 is an apocalyptic number.

71123531 is a deficient number, since it is larger than the sum of its proper divisors (1).

71123531 is an equidigital number, since it uses as much as digits as its factorization.

71123531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 630, while the sum is 23.

The square root of 71123531 is about 8433.4768037862. The cubic root of 71123531 is about 414.3217857330.

Adding to 71123531 its reverse (13532117), we get a palindrome (84655648).

It can be divided in two parts, 711 and 23531, that added together give a palindrome (24242).

The spelling of 71123531 in words is "seventy-one million, one hundred twenty-three thousand, five hundred thirty-one".