1278659461 has 4 divisors (see below), whose sum is σ = 1280766592. Its totient is φ = 1276552332.

The previous prime is 1278659453. The next prime is 1278659467. The reversal of 1278659461 is 1649568721.

It is a happy number.

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 1278659461 - 2³ = 1278659453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278659467) 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, 1052655 + ... + 1053868.

It is an arithmetic number, because the mean of its divisors is an integer number (320191648).

Almost surely, 2^1278659461 is an apocalyptic number.

It is an amenable number.

1278659461 is a deficient number, since it is larger than the sum of its proper divisors (2107131).

1278659461 is an equidigital number, since it uses as much as digits as its factorization.

1278659461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2107130.

The product of its digits is 725760, while the sum is 49.

The square root of 1278659461 is about 35758.3481301919. The cubic root of 1278659461 is about 1085.3878743764.

The spelling of 1278659461 in words is "one billion, two hundred seventy-eight million, six hundred fifty-nine thousand, four hundred sixty-one".