71224477 has 2 divisors, whose sum is σ = 71224478. Its totient is φ = 71224476.

The previous prime is 71224471. The next prime is 71224499. The reversal of 71224477 is 77442217.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57244356 + 13980121 = 7566^2 + 3739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71224477 is a prime.

It is a super-2 number, since 2×71224477² = 10145852247847058, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71224471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35612238 + 35612239.

It is an arithmetic number, because the mean of its divisors is an integer number (35612239).

Almost surely, 2^71224477 is an apocalyptic number.

It is an amenable number.

71224477 is a deficient number, since it is larger than the sum of its proper divisors (1).

71224477 is an equidigital number, since it uses as much as digits as its factorization.

71224477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21952, while the sum is 34.

The square root of 71224477 is about 8439.4595206091. The cubic root of 71224477 is about 414.5177094304.

The spelling of 71224477 in words is "seventy-one million, two hundred twenty-four thousand, four hundred seventy-seven".