1301128978 has 4 divisors (see below), whose sum is σ = 1951693470. Its totient is φ = 650564488.

The previous prime is 1301128951. The next prime is 1301128979. The reversal of 1301128978 is 8798211031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8798211031 = 1619 ⋅5434349.

It can be written as a sum of positive squares in only one way, i.e., 847566769 + 453562209 = 29113^2 + 21297^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1301128978.

It is not an unprimeable number, because it can be changed into a prime (1301128979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325282243 + ... + 325282246.

Almost surely, 2^1301128978 is an apocalyptic number.

1301128978 is a deficient number, since it is larger than the sum of its proper divisors (650564492).

1301128978 is an equidigital number, since it uses as much as digits as its factorization.

1301128978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650564491.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 1301128978 is about 36071.1654649528. The cubic root of 1301128978 is about 1091.7087297378.

The spelling of 1301128978 in words is "one billion, three hundred one million, one hundred twenty-eight thousand, nine hundred seventy-eight".