1331879242 has 4 divisors (see below), whose sum is σ = 1997818866. Its totient is φ = 665939620.

The previous prime is 1331879209. The next prime is 1331879243. The reversal of 1331879242 is 2429781331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 779582241 + 552297001 = 27921^2 + 23501^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1331879195 and 1331879204.

It is not an unprimeable number, because it can be changed into a prime (1331879243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332969809 + ... + 332969812.

Almost surely, 2^1331879242 is an apocalyptic number.

1331879242 is a deficient number, since it is larger than the sum of its proper divisors (665939624).

1331879242 is an equidigital number, since it uses as much as digits as its factorization.

1331879242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665939623.

The product of its digits is 72576, while the sum is 40.

The square root of 1331879242 is about 36494.9207698825. The cubic root of 1331879242 is about 1100.2421621117.

The spelling of 1331879242 in words is "one billion, three hundred thirty-one million, eight hundred seventy-nine thousand, two hundred forty-two".