70997 has 2 divisors, whose sum is σ = 70998. Its totient is φ = 70996.

The previous prime is 70991. The next prime is 70999. The reversal of 70997 is 79907.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42436 + 28561 = 206^2 + 169^2 .

It is an emirp because it is prime and its reverse (79907) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70997 - 2⁴ = 70981 is a prime.

Together with 70999, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 16.

It is a zygodrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35498 + 35499.

It is an arithmetic number, because the mean of its divisors is an integer number (35499).

2⁷⁰⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

70997 is a deficient number, since it is larger than the sum of its proper divisors (1).

70997 is an equidigital number, since it uses as much as digits as its factorization.

70997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3969, while the sum is 32.

The square root of 70997 is about 266.4526224303. The cubic root of 70997 is about 41.4075942722.

The spelling of 70997 in words is "seventy thousand, nine hundred ninety-seven".