1270887161 has 4 divisors (see below), whose sum is σ = 1271143824. Its totient is φ = 1270630500.

The previous prime is 1270887151. The next prime is 1270887169. The reversal of 1270887161 is 1617880721.

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 a de Polignac number, because none of the positive numbers 2^k-1270887161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1270887169) 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, 120755 + ... + 130856.

It is an arithmetic number, because the mean of its divisors is an integer number (317785956).

Almost surely, 2^1270887161 is an apocalyptic number.

It is an amenable number.

1270887161 is a deficient number, since it is larger than the sum of its proper divisors (256663).

1270887161 is an equidigital number, since it uses as much as digits as its factorization.

1270887161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256662.

The product of its (nonzero) digits is 37632, while the sum is 41.

The square root of 1270887161 is about 35649.5043584059. The cubic root of 1270887161 is about 1083.1842355965.

The spelling of 1270887161 in words is "one billion, two hundred seventy million, eight hundred eighty-seven thousand, one hundred sixty-one".