71497729 has 2 divisors, whose sum is σ = 71497730. Its totient is φ = 71497728.

The previous prime is 71497667. The next prime is 71497739. The reversal of 71497729 is 92779417.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42928704 + 28569025 = 6552^2 + 5345^2 .

It is a cyclic number.

It is not a de Polignac number, because 71497729 - 2¹¹ = 71495681 is a prime.

It is a super-2 number, since 2×71497729² = 10223850504314882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71497739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35748864 + 35748865.

It is an arithmetic number, because the mean of its divisors is an integer number (35748865).

Almost surely, 2^71497729 is an apocalyptic number.

It is an amenable number.

71497729 is a deficient number, since it is larger than the sum of its proper divisors (1).

71497729 is an equidigital number, since it uses as much as digits as its factorization.

71497729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 222264, while the sum is 46.

The square root of 71497729 is about 8455.6329745324. The cubic root of 71497729 is about 415.0471306612.

It can be divided in two parts, 7149 and 7729, that added together give a triangular number (14878 = T₁₇₂).

The spelling of 71497729 in words is "seventy-one million, four hundred ninety-seven thousand, seven hundred twenty-nine".