71400449 has 2 divisors, whose sum is σ = 71400450. Its totient is φ = 71400448.

The previous prime is 71400431. The next prime is 71400451. The reversal of 71400449 is 94400417.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38130625 + 33269824 = 6175^2 + 5768^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71400449 is a prime.

Together with 71400451, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71400419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35700224 + 35700225.

It is an arithmetic number, because the mean of its divisors is an integer number (35700225).

Almost surely, 2^71400449 is an apocalyptic number.

It is an amenable number.

71400449 is a deficient number, since it is larger than the sum of its proper divisors (1).

71400449 is an equidigital number, since it uses as much as digits as its factorization.

71400449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 71400449 is about 8449.8786381817. The cubic root of 71400449 is about 414.8588071480.

The spelling of 71400449 in words is "seventy-one million, four hundred thousand, four hundred forty-nine".