1331029979 has 4 divisors (see below), whose sum is σ = 1331114160. Its totient is φ = 1330945800.

The previous prime is 1331029961. The next prime is 1331029993. The reversal of 1331029979 is 9799201331.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9799201331 = 103 ⋅95137877.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331029979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331029879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10439 + ... + 52640.

It is an arithmetic number, because the mean of its divisors is an integer number (332778540).

Almost surely, 2^1331029979 is an apocalyptic number.

1331029979 is a deficient number, since it is larger than the sum of its proper divisors (84181).

1331029979 is an equidigital number, since it uses as much as digits as its factorization.

1331029979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84180.

The product of its (nonzero) digits is 91854, while the sum is 44.

The square root of 1331029979 is about 36483.2835556231. The cubic root of 1331029979 is about 1100.0082586157.

The spelling of 1331029979 in words is "one billion, three hundred thirty-one million, twenty-nine thousand, nine hundred seventy-nine".