1285009161 has 4 divisors (see below), whose sum is σ = 1713345552. Its totient is φ = 856672772.

The previous prime is 1285009153. The next prime is 1285009171. The reversal of 1285009161 is 1619005821.

1285009161 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1285009161 - 2³ = 1285009153 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1285009171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214168191 + ... + 214168196.

It is an arithmetic number, because the mean of its divisors is an integer number (428336388).

Almost surely, 2^1285009161 is an apocalyptic number.

It is an amenable number.

1285009161 is a deficient number, since it is larger than the sum of its proper divisors (428336391).

1285009161 is an equidigital number, since it uses as much as digits as its factorization.

1285009161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428336390.

The product of its (nonzero) digits is 4320, while the sum is 33.

The square root of 1285009161 is about 35847.0244371831. The cubic root of 1285009161 is about 1087.1815525253.

The spelling of 1285009161 in words is "one billion, two hundred eighty-five million, nine thousand, one hundred sixty-one".