70979281 has 4 divisors (see below), whose sum is σ = 71040564. Its totient is φ = 70918000.

The previous prime is 70979273. The next prime is 70979299. The reversal of 70979281 is 18297907.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18297907 = 71 ⋅257717.

It can be written as a sum of positive squares in 2 ways, for example, as 51969681 + 19009600 = 7209^2 + 4360^2 .

It is a cyclic number.

It is not a de Polignac number, because 70979281 - 2³ = 70979273 is a prime.

It is a super-2 number, since 2×70979281² = 10076116662553922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70979201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28870 + ... + 31231.

It is an arithmetic number, because the mean of its divisors is an integer number (17760141).

Almost surely, 2^70979281 is an apocalyptic number.

It is an amenable number.

70979281 is a deficient number, since it is larger than the sum of its proper divisors (61283).

70979281 is a wasteful number, since it uses less digits than its factorization.

70979281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61282.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 70979281 is about 8424.9202370111. The cubic root of 70979281 is about 414.0414923368.

The spelling of 70979281 in words is "seventy million, nine hundred seventy-nine thousand, two hundred eighty-one".