71819401 has 2 divisors, whose sum is σ = 71819402. Its totient is φ = 71819400.

The previous prime is 71819381. The next prime is 71819437. The reversal of 71819401 is 10491817.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70963776 + 855625 = 8424^2 + 925^2 .

It is a cyclic number.

It is not a de Polignac number, because 71819401 - 2⁵ = 71819369 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71819471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35909700 + 35909701.

It is an arithmetic number, because the mean of its divisors is an integer number (35909701).

Almost surely, 2^71819401 is an apocalyptic number.

It is an amenable number.

71819401 is a deficient number, since it is larger than the sum of its proper divisors (1).

71819401 is an equidigital number, since it uses as much as digits as its factorization.

71819401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 71819401 is about 8474.6327944047. The cubic root of 71819401 is about 415.6686390646.

The spelling of 71819401 in words is "seventy-one million, eight hundred nineteen thousand, four hundred one".