70970281 has 4 divisors (see below), whose sum is σ = 71362564. Its totient is φ = 70578000.

The previous prime is 70970269. The next prime is 70970299. The reversal of 70970281 is 18207907.

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 37515625 + 33454656 = 6125^2 + 5784^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70970281 is a prime.

It is a super-2 number, since 2×70970281² = 10073561570437922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70970261) 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, 195870 + ... + 196231.

It is an arithmetic number, because the mean of its divisors is an integer number (17840641).

Almost surely, 2^70970281 is an apocalyptic number.

70970281 is the 3768-th centered decagonal number.

It is an amenable number.

70970281 is a deficient number, since it is larger than the sum of its proper divisors (392283).

70970281 is a wasteful number, since it uses less digits than its factorization.

70970281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392282.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 70970281 is about 8424.3860903926. The cubic root of 70970281 is about 414.0239917794.

The spelling of 70970281 in words is "seventy million, nine hundred seventy thousand, two hundred eighty-one".