71172769 has 2 divisors, whose sum is σ = 71172770. Its totient is φ = 71172768.

The previous prime is 71172767. The next prime is 71172779. The reversal of 71172769 is 96727117.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56250000 + 14922769 = 7500^2 + 3863^2 .

It is a cyclic number.

It is not a de Polignac number, because 71172769 - 2¹ = 71172767 is a prime.

It is a super-2 number, since 2×71172769² = 10131126094254722, which contains 22 as substring.

Together with 71172767, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (71172763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35586384 + 35586385.

It is an arithmetic number, because the mean of its divisors is an integer number (35586385).

Almost surely, 2^71172769 is an apocalyptic number.

It is an amenable number.

71172769 is a deficient number, since it is larger than the sum of its proper divisors (1).

71172769 is an equidigital number, since it uses as much as digits as its factorization.

71172769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37044, while the sum is 40.

The square root of 71172769 is about 8436.3954980785. The cubic root of 71172769 is about 414.4173737424.

The spelling of 71172769 in words is "seventy-one million, one hundred seventy-two thousand, seven hundred sixty-nine".