70198109 has 4 divisors (see below), whose sum is σ = 71910300. Its totient is φ = 68485920.

The previous prime is 70198097. The next prime is 70198133. The reversal of 70198109 is 90189107.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90189107 = 109 ⋅827423.

It can be written as a sum of positive squares in 2 ways, for example, as 3694084 + 66504025 = 1922^2 + 8155^2 .

It is a cyclic number.

It is not a de Polignac number, because 70198109 - 2²⁰ = 69149533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70198189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 856034 + ... + 856115.

It is an arithmetic number, because the mean of its divisors is an integer number (17977575).

Almost surely, 2^70198109 is an apocalyptic number.

It is an amenable number.

70198109 is a deficient number, since it is larger than the sum of its proper divisors (1712191).

70198109 is a wasteful number, since it uses less digits than its factorization.

70198109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712190.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 70198109 is about 8378.4311777325. The cubic root of 70198109 is about 412.5169560217.

It can be divided in two parts, 70198 and 109, that added together give a palindrome (70307).

The spelling of 70198109 in words is "seventy million, one hundred ninety-eight thousand, one hundred nine".