1278501085 has 8 divisors (see below), whose sum is σ = 1536232536. Its totient is φ = 1021446720.

The previous prime is 1278501079. The next prime is 1278501113. The reversal of 1278501085 is 5801058721.

It can be written as a sum of positive squares in 4 ways, for example, as 1653796 + 1276847289 = 1286^2 + 35733^2 .

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

It is not a de Polignac number, because 1278501085 - 2⁵ = 1278501053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165106 + ... + 172675.

It is an arithmetic number, because the mean of its divisors is an integer number (192029067).

Almost surely, 2^1278501085 is an apocalyptic number.

It is an amenable number.

1278501085 is a deficient number, since it is larger than the sum of its proper divisors (257731451).

1278501085 is an equidigital number, since it uses as much as digits as its factorization.

1278501085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338543.

The product of its (nonzero) digits is 22400, while the sum is 37.

The square root of 1278501085 is about 35756.1335297876. The cubic root of 1278501085 is about 1085.3430601281.

The spelling of 1278501085 in words is "one billion, two hundred seventy-eight million, five hundred one thousand, eighty-five".