71538811 has 2 divisors, whose sum is σ = 71538812. Its totient is φ = 71538810.

The previous prime is 71538773. The next prime is 71538821. The reversal of 71538811 is 11883517.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71538811 is a prime.

It is not a weakly prime, because it can be changed into another prime (71538821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35769405 + 35769406.

It is an arithmetic number, because the mean of its divisors is an integer number (35769406).

Almost surely, 2^71538811 is an apocalyptic number.

71538811 is a deficient number, since it is larger than the sum of its proper divisors (1).

71538811 is an equidigital number, since it uses as much as digits as its factorization.

71538811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 34.

The square root of 71538811 is about 8458.0618938383. The cubic root of 71538811 is about 415.1266096494.

The spelling of 71538811 in words is "seventy-one million, five hundred thirty-eight thousand, eight hundred eleven".