70825309 has 2 divisors, whose sum is σ = 70825310. Its totient is φ = 70825308.

The previous prime is 70825291. The next prime is 70825319. The reversal of 70825309 is 90352807.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42968025 + 27857284 = 6555^2 + 5278^2 .

It is a cyclic number.

It is not a de Polignac number, because 70825309 - 2¹¹ = 70823261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70825319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35412654 + 35412655.

It is an arithmetic number, because the mean of its divisors is an integer number (35412655).

Almost surely, 2^70825309 is an apocalyptic number.

It is an amenable number.

70825309 is a deficient number, since it is larger than the sum of its proper divisors (1).

70825309 is an equidigital number, since it uses as much as digits as its factorization.

70825309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 70825309 is about 8415.7773853638. Note that the first 3 decimals coincide. The cubic root of 70825309 is about 413.7418887126.

The spelling of 70825309 in words is "seventy million, eight hundred twenty-five thousand, three hundred nine".