1331742979 has 16 divisors (see below), whose sum is σ = 1558914048. Its totient is φ = 1113944832.

The previous prime is 1331742977. The next prime is 1331742983. The reversal of 1331742979 is 9792471331.

1331742979 = 3003² + 3004² + ... + 3143².

It is not a de Polignac number, because 1331742979 - 2¹ = 1331742977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1331742977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110404 + ... + 121870.

It is an arithmetic number, because the mean of its divisors is an integer number (97432128).

Almost surely, 2^1331742979 is an apocalyptic number.

1331742979 is a deficient number, since it is larger than the sum of its proper divisors (227171069).

1331742979 is a wasteful number, since it uses less digits than its factorization.

1331742979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11874.

The product of its digits is 285768, while the sum is 46.

The square root of 1331742979 is about 36493.0538459033. The cubic root of 1331742979 is about 1100.2046393379.

The spelling of 1331742979 in words is "one billion, three hundred thirty-one million, seven hundred forty-two thousand, nine hundred seventy-nine".