70690181 has 4 divisors (see below), whose sum is σ = 72024012. Its totient is φ = 69356352.

The previous prime is 70690171. The next prime is 70690183. The reversal of 70690181 is 18109607.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34281025 + 36409156 = 5855^2 + 6034^2 .

It is a cyclic number.

It is not a de Polignac number, because 70690181 - 2⁶ = 70690117 is a prime.

It is a super-2 number, since 2×70690181² = 9994203379625522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70690183) 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, 666836 + ... + 666941.

It is an arithmetic number, because the mean of its divisors is an integer number (18006003).

Almost surely, 2^70690181 is an apocalyptic number.

It is an amenable number.

70690181 is a deficient number, since it is larger than the sum of its proper divisors (1333831).

70690181 is a wasteful number, since it uses less digits than its factorization.

70690181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333830.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 70690181 is about 8407.7452982354. The cubic root of 70690181 is about 413.4785943797.

Adding to 70690181 its reverse (18109607), we get a palindrome (88799788).

The spelling of 70690181 in words is "seventy million, six hundred ninety thousand, one hundred eighty-one".