71081629 has 2 divisors, whose sum is σ = 71081630. Its totient is φ = 71081628.

The previous prime is 71081611. The next prime is 71081657. The reversal of 71081629 is 92618017.

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., 35976004 + 35105625 = 5998^2 + 5925^2 .

It is a cyclic number.

It is not a de Polignac number, because 71081629 - 2⁷ = 71081501 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71081594 and 71081603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71081669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35540814 + 35540815.

It is an arithmetic number, because the mean of its divisors is an integer number (35540815).

Almost surely, 2^71081629 is an apocalyptic number.

It is an amenable number.

71081629 is a deficient number, since it is larger than the sum of its proper divisors (1).

71081629 is an equidigital number, since it uses as much as digits as its factorization.

71081629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 71081629 is about 8430.9921717435. The cubic root of 71081629 is about 414.2404046875.

The spelling of 71081629 in words is "seventy-one million, eighty-one thousand, six hundred twenty-nine".