71445131 has 2 divisors, whose sum is σ = 71445132. Its totient is φ = 71445130.

The previous prime is 71445119. The next prime is 71445139. The reversal of 71445131 is 13154417.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71445131 is a prime.

It is a super-2 number, since 2×71445131² = 10208813487214322, 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 71445131.

It is not a weakly prime, because it can be changed into another prime (71445139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35722565 + 35722566.

It is an arithmetic number, because the mean of its divisors is an integer number (35722566).

Almost surely, 2^71445131 is an apocalyptic number.

71445131 is a deficient number, since it is larger than the sum of its proper divisors (1).

71445131 is an equidigital number, since it uses as much as digits as its factorization.

71445131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 26.

The square root of 71445131 is about 8452.5221679686. The cubic root of 71445131 is about 414.9453278730.

Adding to 71445131 its reverse (13154417), we get a palindrome (84599548).

The spelling of 71445131 in words is "seventy-one million, four hundred forty-five thousand, one hundred thirty-one".