70872121 has 2 divisors, whose sum is σ = 70872122. Its totient is φ = 70872120.

The previous prime is 70872101. The next prime is 70872161. The reversal of 70872121 is 12127807.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51194025 + 19678096 = 7155^2 + 4436^2 .

It is an emirp because it is prime and its reverse (12127807) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70872121 - 2⁵ = 70872089 is a prime.

It is equal to p_4166308 and since 70872121 and 4166308 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 70872121.

It is not a weakly prime, because it can be changed into another prime (70872101) 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, 35436060 + 35436061.

It is an arithmetic number, because the mean of its divisors is an integer number (35436061).

Almost surely, 2^70872121 is an apocalyptic number.

It is an amenable number.

70872121 is a deficient number, since it is larger than the sum of its proper divisors (1).

70872121 is an equidigital number, since it uses as much as digits as its factorization.

70872121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 70872121 is about 8418.5581307015. The cubic root of 70872121 is about 413.8330228944.

Adding to 70872121 its reverse (12127807), we get a palindrome (82999928).

The spelling of 70872121 in words is "seventy million, eight hundred seventy-two thousand, one hundred twenty-one".