71213477 has 2 divisors, whose sum is σ = 71213478. Its totient is φ = 71213476.

The previous prime is 71213437. The next prime is 71213491. The reversal of 71213477 is 77431217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56460196 + 14753281 = 7514^2 + 3841^2 .

It is an emirp because it is prime and its reverse (77431217) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71213477 - 2¹² = 71209381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71213437) 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, 35606738 + 35606739.

It is an arithmetic number, because the mean of its divisors is an integer number (35606739).

Almost surely, 2^71213477 is an apocalyptic number.

It is an amenable number.

71213477 is a deficient number, since it is larger than the sum of its proper divisors (1).

71213477 is an equidigital number, since it uses as much as digits as its factorization.

71213477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8232, while the sum is 32.

The square root of 71213477 is about 8438.8077949435. The cubic root of 71213477 is about 414.4963687820.

The spelling of 71213477 in words is "seventy-one million, two hundred thirteen thousand, four hundred seventy-seven".