71172257 has 4 divisors (see below), whose sum is σ = 76647060. Its totient is φ = 65697456.

The previous prime is 71172253. The next prime is 71172301. The reversal of 71172257 is 75227117.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75227117 = 7 ⋅10746731.

It can be written as a sum of positive squares in 2 ways, for example, as 17648401 + 53523856 = 4201^2 + 7316^2 .

It is a cyclic number.

It is not a de Polignac number, because 71172257 - 2² = 71172253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71172253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2737382 + ... + 2737407.

It is an arithmetic number, because the mean of its divisors is an integer number (19161765).

Almost surely, 2^71172257 is an apocalyptic number.

It is an amenable number.

71172257 is a deficient number, since it is larger than the sum of its proper divisors (5474803).

71172257 is a wasteful number, since it uses less digits than its factorization.

71172257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5474802.

The product of its digits is 6860, while the sum is 32.

The square root of 71172257 is about 8436.3651533110. The cubic root of 71172257 is about 414.4163799999.

The spelling of 71172257 in words is "seventy-one million, one hundred seventy-two thousand, two hundred fifty-seven".