71696257 has 2 divisors, whose sum is σ = 71696258. Its totient is φ = 71696256.

The previous prime is 71696189. The next prime is 71696263. The reversal of 71696257 is 75269617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69956496 + 1739761 = 8364^2 + 1319^2 .

It is an emirp because it is prime and its reverse (75269617) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71696257 - 2¹¹ = 71694209 is a prime.

It is not a weakly prime, because it can be changed into another prime (71696357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35848128 + 35848129.

It is an arithmetic number, because the mean of its divisors is an integer number (35848129).

Almost surely, 2^71696257 is an apocalyptic number.

It is an amenable number.

71696257 is a deficient number, since it is larger than the sum of its proper divisors (1).

71696257 is an equidigital number, since it uses as much as digits as its factorization.

71696257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158760, while the sum is 43.

The square root of 71696257 is about 8467.3642297943. The cubic root of 71696257 is about 415.4309299322.

The spelling of 71696257 in words is "seventy-one million, six hundred ninety-six thousand, two hundred fifty-seven".