70245691 has 4 divisors (see below), whose sum is σ = 70927792. Its totient is φ = 69563592.

The previous prime is 70245689. The next prime is 70245697. The reversal of 70245691 is 19654207.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19654207 = 1301 ⋅15107.

It is a cyclic number.

It is not a de Polignac number, because 70245691 - 2¹ = 70245689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70245697) 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 in 3 ways as a sum of consecutive naturals, for example, 340896 + ... + 341101.

It is an arithmetic number, because the mean of its divisors is an integer number (17731948).

Almost surely, 2^70245691 is an apocalyptic number.

70245691 is a deficient number, since it is larger than the sum of its proper divisors (682101).

70245691 is a wasteful number, since it uses less digits than its factorization.

70245691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682100.

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

The square root of 70245691 is about 8381.2702497891. The cubic root of 70245691 is about 412.6101396743.

Adding to 70245691 its reverse (19654207), we get a palindrome (89899898).

The spelling of 70245691 in words is "seventy million, two hundred forty-five thousand, six hundred ninety-one".