71413721 has 2 divisors, whose sum is σ = 71413722. Its totient is φ = 71413720.

The previous prime is 71413703. The next prime is 71413807. The reversal of 71413721 is 12731417.

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., 37027225 + 34386496 = 6085^2 + 5864^2 .

It is an emirp because it is prime and its reverse (12731417) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71413721 is a prime.

It is not a weakly prime, because it can be changed into another prime (71412721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35706860 + 35706861.

It is an arithmetic number, because the mean of its divisors is an integer number (35706861).

Almost surely, 2^71413721 is an apocalyptic number.

It is an amenable number.

71413721 is a deficient number, since it is larger than the sum of its proper divisors (1).

71413721 is an equidigital number, since it uses as much as digits as its factorization.

71413721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1176, while the sum is 26.

The square root of 71413721 is about 8450.6639384134. The cubic root of 71413721 is about 414.8845103710.

The spelling of 71413721 in words is "seventy-one million, four hundred thirteen thousand, seven hundred twenty-one".