70797917 has 2 divisors, whose sum is σ = 70797918. Its totient is φ = 70797916.

The previous prime is 70797913. The next prime is 70797919. The reversal of 70797917 is 71979707.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70123876 + 674041 = 8374^2 + 821^2 .

It is an emirp because it is prime and its reverse (71979707) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70797917 - 2² = 70797913 is a prime.

Together with 70797919, 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 (70797913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35398958 + 35398959.

It is an arithmetic number, because the mean of its divisors is an integer number (35398959).

Almost surely, 2^70797917 is an apocalyptic number.

It is an amenable number.

70797917 is a deficient number, since it is larger than the sum of its proper divisors (1).

70797917 is an equidigital number, since it uses as much as digits as its factorization.

70797917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194481, while the sum is 47.

The square root of 70797917 is about 8414.1498085071. The cubic root of 70797917 is about 413.6885430026.

The spelling of 70797917 in words is "seventy million, seven hundred ninety-seven thousand, nine hundred seventeen".