70581691 has 2 divisors, whose sum is σ = 70581692. Its totient is φ = 70581690.

The previous prime is 70581689. The next prime is 70581701. The reversal of 70581691 is 19618507.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 70581691 - 2¹ = 70581689 is a prime.

It is a super-3 number, since 3×70581691³ (a number of 25 digits) contains 333 as substring.

Together with 70581689, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 70581691.

It is not a weakly prime, because it can be changed into another prime (70581611) 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, 35290845 + 35290846.

It is an arithmetic number, because the mean of its divisors is an integer number (35290846).

Almost surely, 2^70581691 is an apocalyptic number.

70581691 is a deficient number, since it is larger than the sum of its proper divisors (1).

70581691 is an equidigital number, since it uses as much as digits as its factorization.

70581691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 70581691 is about 8401.2910317403. The cubic root of 70581691 is about 413.2669607410.

The spelling of 70581691 in words is "seventy million, five hundred eighty-one thousand, six hundred ninety-one".