71249257 has 2 divisors, whose sum is σ = 71249258. Its totient is φ = 71249256.

The previous prime is 71249249. The next prime is 71249263. The reversal of 71249257 is 75294217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37015056 + 34234201 = 6084^2 + 5851^2 .

It is a cyclic number.

It is not a de Polignac number, because 71249257 - 2³ = 71249249 is a prime.

It is not a weakly prime, because it can be changed into another prime (71249287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35624628 + 35624629.

It is an arithmetic number, because the mean of its divisors is an integer number (35624629).

Almost surely, 2^71249257 is an apocalyptic number.

It is an amenable number.

71249257 is a deficient number, since it is larger than the sum of its proper divisors (1).

71249257 is an equidigital number, since it uses as much as digits as its factorization.

71249257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 37.

The square root of 71249257 is about 8440.9274964307. The cubic root of 71249257 is about 414.5657760421.

The spelling of 71249257 in words is "seventy-one million, two hundred forty-nine thousand, two hundred fifty-seven".