1278864001 has 4 divisors (see below), whose sum is σ = 1281469104. Its totient is φ = 1276258900.

The previous prime is 1278863969. The next prime is 1278864017. The reversal of 1278864001 is 1004688721.

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 1278864001 - 2⁵ = 1278863969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1278864061) 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, 1301815 + ... + 1302796.

It is an arithmetic number, because the mean of its divisors is an integer number (320367276).

Almost surely, 2^1278864001 is an apocalyptic number.

It is an amenable number.

1278864001 is a deficient number, since it is larger than the sum of its proper divisors (2605103).

1278864001 is an equidigital number, since it uses as much as digits as its factorization.

1278864001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2605102.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 1278864001 is about 35761.2080472682. The cubic root of 1278864001 is about 1085.4457457659.

The spelling of 1278864001 in words is "one billion, two hundred seventy-eight million, eight hundred sixty-four thousand, one".