1278320951 has 8 divisors (see below), whose sum is σ = 1282446000. Its totient is φ = 1274203840.

The previous prime is 1278320947. The next prime is 1278320959. The reversal of 1278320951 is 1590238721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1278320951 - 2² = 1278320947 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 (1278320959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 500225 + ... + 502773.

It is an arithmetic number, because the mean of its divisors is an integer number (160305750).

Almost surely, 2^1278320951 is an apocalyptic number.

1278320951 is a deficient number, since it is larger than the sum of its proper divisors (4125049).

1278320951 is an equidigital number, since it uses as much as digits as its factorization.

1278320951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3969.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 1278320951 is about 35753.6145165772. The cubic root of 1278320951 is about 1085.2920847133.

The spelling of 1278320951 in words is "one billion, two hundred seventy-eight million, three hundred twenty thousand, nine hundred fifty-one".