70908991 has 2 divisors, whose sum is σ = 70908992. Its totient is φ = 70908990.

The previous prime is 70908979. The next prime is 70909009. The reversal of 70908991 is 19980907.

It is a weak prime.

It is an emirp because it is prime and its reverse (19980907) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70908991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70908911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35454495 + 35454496.

It is an arithmetic number, because the mean of its divisors is an integer number (35454496).

Almost surely, 2^70908991 is an apocalyptic number.

70908991 is a deficient number, since it is larger than the sum of its proper divisors (1).

70908991 is an equidigital number, since it uses as much as digits as its factorization.

70908991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 70908991 is about 8420.7476508918. The cubic root of 70908991 is about 413.9047736204.

The spelling of 70908991 in words is "seventy million, nine hundred eight thousand, nine hundred ninety-one".