2870009861 has 2 divisors, whose sum is σ = 2870009862.
Its totient is φ = 2870009860.
The previous prime is 2870009843. The next prime is 2870009917. The reversal of 2870009861 is 1689000782.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 2869637761 + 372100 = 53569^2 + 610^2
It is a cyclic number.
It is not a de Polignac number, because 2870009861 - 26 = 2870009797 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (2870009561) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1435004930 + 1435004931.
It is an arithmetic number, because the mean of its divisors is an integer number (1435004931).
Almost surely, 22870009861 is an apocalyptic number.
It is an amenable number.
2870009861 is a deficient number, since it is larger than the sum of its proper divisors (1).
2870009861 is an equidigital number, since it uses as much as digits as its factorization.
2870009861 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 48384, while the sum is 41.
The square root of 2870009861 is about 53572.4729782003.
The cubic root of 2870009861 is about 1421.1103299221.
The spelling of 2870009861 in words is "two billion, eight hundred seventy million, nine thousand, eight hundred sixty-one".