71684957 has 2 divisors, whose sum is σ = 71684958. Its totient is φ = 71684956.

The previous prime is 71684923. The next prime is 71684959. The reversal of 71684957 is 75948617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62315236 + 9369721 = 7894^2 + 3061^2 .

It is an emirp because it is prime and its reverse (75948617) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71684957 - 2¹⁶ = 71619421 is a prime.

Together with 71684959, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71684959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35842478 + 35842479.

It is an arithmetic number, because the mean of its divisors is an integer number (35842479).

Almost surely, 2^71684957 is an apocalyptic number.

It is an amenable number.

71684957 is a deficient number, since it is larger than the sum of its proper divisors (1).

71684957 is an equidigital number, since it uses as much as digits as its factorization.

71684957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 47.

The square root of 71684957 is about 8466.6969356414. The cubic root of 71684957 is about 415.4091035201.

The spelling of 71684957 in words is "seventy-one million, six hundred eighty-four thousand, nine hundred fifty-seven".