70281889 has 2 divisors, whose sum is σ = 70281890. Its totient is φ = 70281888.

The previous prime is 70281863. The next prime is 70281919. The reversal of 70281889 is 98818207.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63728289 + 6553600 = 7983^2 + 2560^2 .

It is an emirp because it is prime and its reverse (98818207) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70281889 - 2⁹ = 70281377 is a prime.

It is not a weakly prime, because it can be changed into another prime (70281989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35140944 + 35140945.

It is an arithmetic number, because the mean of its divisors is an integer number (35140945).

Almost surely, 2^70281889 is an apocalyptic number.

It is an amenable number.

70281889 is a deficient number, since it is larger than the sum of its proper divisors (1).

70281889 is an equidigital number, since it uses as much as digits as its factorization.

70281889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 43.

The square root of 70281889 is about 8383.4294295354. The cubic root of 70281889 is about 412.6810009465.

The spelling of 70281889 in words is "seventy million, two hundred eighty-one thousand, eight hundred eighty-nine".