71522551 has 2 divisors, whose sum is σ = 71522552. Its totient is φ = 71522550.

The previous prime is 71522543. The next prime is 71522597. The reversal of 71522551 is 15522517.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71522551 - 2³ = 71522543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71522501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35761275 + 35761276.

It is an arithmetic number, because the mean of its divisors is an integer number (35761276).

Almost surely, 2^71522551 is an apocalyptic number.

71522551 is a deficient number, since it is larger than the sum of its proper divisors (1).

71522551 is an equidigital number, since it uses as much as digits as its factorization.

71522551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3500, while the sum is 28.

The square root of 71522551 is about 8457.1006261011. The cubic root of 71522551 is about 415.0951559996.

The spelling of 71522551 in words is "seventy-one million, five hundred twenty-two thousand, five hundred fifty-one".