70161691 has 2 divisors, whose sum is σ = 70161692. Its totient is φ = 70161690.

The previous prime is 70161667. The next prime is 70161709. The reversal of 70161691 is 19616107.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 70161691 - 2⁷ = 70161563 is a prime.

It is not a weakly prime, because it can be changed into another prime (70161191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35080845 + 35080846.

It is an arithmetic number, because the mean of its divisors is an integer number (35080846).

Almost surely, 2^70161691 is an apocalyptic number.

70161691 is a deficient number, since it is larger than the sum of its proper divisors (1).

70161691 is an equidigital number, since it uses as much as digits as its factorization.

70161691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 70161691 is about 8376.2575772239. The cubic root of 70161691 is about 412.4456072755.

Adding to 70161691 its reverse (19616107), we get a palindrome (89777798).

The spelling of 70161691 in words is "seventy million, one hundred sixty-one thousand, six hundred ninety-one".