1278131061 has 16 divisors (see below), whose sum is σ = 1732068800. Its totient is φ = 838176768.

The previous prime is 1278131059. The next prime is 1278131081. The reversal of 1278131061 is 1601318721.

It is not a de Polignac number, because 1278131061 - 2¹ = 1278131059 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 (1278131051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150435 + ... + 158703.

It is an arithmetic number, because the mean of its divisors is an integer number (108254300).

Almost surely, 2^1278131061 is an apocalyptic number.

It is an amenable number.

1278131061 is a deficient number, since it is larger than the sum of its proper divisors (453937739).

1278131061 is an equidigital number, since it uses as much as digits as its factorization.

1278131061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9108.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 1278131061 is about 35750.9588822454. The cubic root of 1278131061 is about 1085.2383433011.

Adding to 1278131061 its reverse (1601318721), we get a palindrome (2879449782).

The spelling of 1278131061 in words is "one billion, two hundred seventy-eight million, one hundred thirty-one thousand, sixty-one".