71549999 has 2 divisors, whose sum is σ = 71550000. Its totient is φ = 71549998.

The previous prime is 71549983. The next prime is 71550049. The reversal of 71549999 is 99994517.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71549999 - 2⁴ = 71549983 is a prime.

It is a Chen prime.

71549999 is a modest number, since divided by 9999 gives 7154 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 71549999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71549909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35774999 + 35775000.

It is an arithmetic number, because the mean of its divisors is an integer number (35775000).

Almost surely, 2^71549999 is an apocalyptic number.

71549999 is a deficient number, since it is larger than the sum of its proper divisors (1).

71549999 is an equidigital number, since it uses as much as digits as its factorization.

71549999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 918540, while the sum is 53.

The square root of 71549999 is about 8458.7232488124. The cubic root of 71549999 is about 415.1482491593.

The spelling of 71549999 in words is "seventy-one million, five hundred forty-nine thousand, nine hundred ninety-nine".