70643897 has 2 divisors, whose sum is σ = 70643898. Its totient is φ = 70643896.

The previous prime is 70643887. The next prime is 70643899. The reversal of 70643897 is 79834607.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68624656 + 2019241 = 8284^2 + 1421^2 .

It is a cyclic number.

It is not a de Polignac number, because 70643897 - 2²⁶ = 3535033 is a prime.

Together with 70643899, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (70643899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35321948 + 35321949.

It is an arithmetic number, because the mean of its divisors is an integer number (35321949).

Almost surely, 2^70643897 is an apocalyptic number.

It is an amenable number.

70643897 is a deficient number, since it is larger than the sum of its proper divisors (1).

70643897 is an equidigital number, since it uses as much as digits as its factorization.

70643897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 70643897 is about 8404.9923854814. The cubic root of 70643897 is about 413.3883337465.

The spelling of 70643897 in words is "seventy million, six hundred forty-three thousand, eight hundred ninety-seven".