70509091 has 4 divisors (see below), whose sum is σ = 70916832. Its totient is φ = 70101352.

The previous prime is 70509077. The next prime is 70509119. The reversal of 70509091 is 19090507.

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

It is a cyclic number.

It is not a de Polignac number, because 70509091 - 2²³ = 62120483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70509391) 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, 203611 + ... + 203956.

It is an arithmetic number, because the mean of its divisors is an integer number (17729208).

Almost surely, 2^70509091 is an apocalyptic number.

70509091 is a deficient number, since it is larger than the sum of its proper divisors (407741).

70509091 is a wasteful number, since it uses less digits than its factorization.

70509091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407740.

The product of its (nonzero) digits is 2835, while the sum is 31.

The square root of 70509091 is about 8396.9691555942. The cubic root of 70509091 is about 413.1252173046.

Adding to 70509091 its reverse (19090507), we get a palindrome (89599598).

The spelling of 70509091 in words is "seventy million, five hundred nine thousand, ninety-one".