71223487 has 2 divisors, whose sum is σ = 71223488. Its totient is φ = 71223486.

The previous prime is 71223413. The next prime is 71223491. The reversal of 71223487 is 78432217.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71223487 - 2⁷ = 71223359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71223497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35611743 + 35611744.

It is an arithmetic number, because the mean of its divisors is an integer number (35611744).

Almost surely, 2^71223487 is an apocalyptic number.

71223487 is a deficient number, since it is larger than the sum of its proper divisors (1).

71223487 is an equidigital number, since it uses as much as digits as its factorization.

71223487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18816, while the sum is 34.

The square root of 71223487 is about 8439.4008673602. The cubic root of 71223487 is about 414.5157888620.

It can be divided in two parts, 7122 and 3487, that added together give a square (10609 = 103²).

The spelling of 71223487 in words is "seventy-one million, two hundred twenty-three thousand, four hundred eighty-seven".