71649811 has 2 divisors, whose sum is σ = 71649812. Its totient is φ = 71649810.

The previous prime is 71649803. The next prime is 71649827. The reversal of 71649811 is 11894617.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71649811 - 2³ = 71649803 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71649311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35824905 + 35824906.

It is an arithmetic number, because the mean of its divisors is an integer number (35824906).

Almost surely, 2^71649811 is an apocalyptic number.

71649811 is a deficient number, since it is larger than the sum of its proper divisors (1).

71649811 is an equidigital number, since it uses as much as digits as its factorization.

71649811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 37.

The square root of 71649811 is about 8464.6211374166. The cubic root of 71649811 is about 415.3412029188.

The spelling of 71649811 in words is "seventy-one million, six hundred forty-nine thousand, eight hundred eleven".