70587821 has 2 divisors, whose sum is σ = 70587822. Its totient is φ = 70587820.

The previous prime is 70587817. The next prime is 70587863. The reversal of 70587821 is 12878507.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46430596 + 24157225 = 6814^2 + 4915^2 .

It is a cyclic number.

It is not a de Polignac number, because 70587821 - 2² = 70587817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70587871) 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 as a sum of consecutive naturals, namely, 35293910 + 35293911.

It is an arithmetic number, because the mean of its divisors is an integer number (35293911).

Almost surely, 2^70587821 is an apocalyptic number.

It is an amenable number.

70587821 is a deficient number, since it is larger than the sum of its proper divisors (1).

70587821 is an equidigital number, since it uses as much as digits as its factorization.

70587821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 70587821 is about 8401.6558487003. The cubic root of 70587821 is about 413.2789244344.

The spelling of 70587821 in words is "seventy million, five hundred eighty-seven thousand, eight hundred twenty-one".