1278781041 has 8 divisors (see below), whose sum is σ = 1706361184. Its totient is φ = 851860800.

The previous prime is 1278780991. The next prime is 1278781069. The reversal of 1278781041 is 1401878721.

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

It is not a de Polignac number, because 1278781041 - 2²² = 1274586737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1278781241) 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, 160435 + ... + 168216.

It is an arithmetic number, because the mean of its divisors is an integer number (213295148).

Almost surely, 2^1278781041 is an apocalyptic number.

It is an amenable number.

1278781041 is a deficient number, since it is larger than the sum of its proper divisors (427580143).

1278781041 is a wasteful number, since it uses less digits than its factorization.

1278781041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329951.

The product of its (nonzero) digits is 25088, while the sum is 39.

The square root of 1278781041 is about 35760.0481123837. The cubic root of 1278781041 is about 1085.4222742771.

The spelling of 1278781041 in words is "one billion, two hundred seventy-eight million, seven hundred eighty-one thousand, forty-one".