71241551 has 2 divisors, whose sum is σ = 71241552. Its totient is φ = 71241550.

The previous prime is 71241523. The next prime is 71241589. The reversal of 71241551 is 15514217.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71241551 is a prime.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 71241551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71211551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35620775 + 35620776.

It is an arithmetic number, because the mean of its divisors is an integer number (35620776).

Almost surely, 2^71241551 is an apocalyptic number.

71241551 is a deficient number, since it is larger than the sum of its proper divisors (1).

71241551 is an equidigital number, since it uses as much as digits as its factorization.

71241551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1400, while the sum is 26.

The square root of 71241551 is about 8440.4710176625. The cubic root of 71241551 is about 414.5508296451.

Adding to 71241551 its reverse (15514217), we get a palindrome (86755768).

The spelling of 71241551 in words is "seventy-one million, two hundred forty-one thousand, five hundred fifty-one".