70821361 has 4 divisors (see below), whose sum is σ = 76269172. Its totient is φ = 65373552.

The previous prime is 70821313. The next prime is 70821383. The reversal of 70821361 is 16312807.

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 17808400 + 53012961 = 4220^2 + 7281^2 .

It is a cyclic number.

It is not a de Polignac number, because 70821361 - 2¹⁷ = 70690289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70824361) 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, 2723886 + ... + 2723911.

It is an arithmetic number, because the mean of its divisors is an integer number (19067293).

Almost surely, 2^70821361 is an apocalyptic number.

It is an amenable number.

70821361 is a deficient number, since it is larger than the sum of its proper divisors (5447811).

70821361 is a wasteful number, since it uses less digits than its factorization.

70821361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5447810.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 70821361 is about 8415.5428226586. The cubic root of 70821361 is about 413.7342008613.

The spelling of 70821361 in words is "seventy million, eight hundred twenty-one thousand, three hundred sixty-one".