71043551 has 2 divisors, whose sum is σ = 71043552. Its totient is φ = 71043550.

The previous prime is 71043541. The next prime is 71043569. The reversal of 71043551 is 15534017.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71043551 is a prime.

It is a super-2 number, since 2×71043551² = 10094372277379202, 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 71043551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71043521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35521775 + 35521776.

It is an arithmetic number, because the mean of its divisors is an integer number (35521776).

Almost surely, 2^71043551 is an apocalyptic number.

71043551 is a deficient number, since it is larger than the sum of its proper divisors (1).

71043551 is an equidigital number, since it uses as much as digits as its factorization.

71043551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 71043551 is about 8428.7336534025. The cubic root of 71043551 is about 414.1664227798.

Adding to 71043551 its reverse (15534017), we get a palindrome (86577568).

The spelling of 71043551 in words is "seventy-one million, forty-three thousand, five hundred fifty-one".