70917121 has 8 divisors (see below), whose sum is σ = 77477184. Its totient is φ = 64375920.

The previous prime is 70917107. The next prime is 70917131. The reversal of 70917121 is 12171907.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 70917121 - 2⁵ = 70917089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 70917121.

It is not an unprimeable number, because it can be changed into a prime (70917131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3835 + ... + 12511.

It is an arithmetic number, because the mean of its divisors is an integer number (9684648).

Almost surely, 2^70917121 is an apocalyptic number.

It is an amenable number.

70917121 is a deficient number, since it is larger than the sum of its proper divisors (6560063).

70917121 is a wasteful number, since it uses less digits than its factorization.

70917121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9431.

The product of its (nonzero) digits is 882, while the sum is 28.

The square root of 70917121 is about 8421.2303732887. The cubic root of 70917121 is about 413.9205916296.

The spelling of 70917121 in words is "seventy million, nine hundred seventeen thousand, one hundred twenty-one".