1331402243 has 4 divisors (see below), whose sum is σ = 1409720040. Its totient is φ = 1253084448.

The previous prime is 1331402231. The next prime is 1331402279. The reversal of 1331402243 is 3422041331.

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

It is a cyclic number.

It is not a de Polignac number, because 1331402243 - 2⁴ = 1331402227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331402213) 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, 39158873 + ... + 39158906.

It is an arithmetic number, because the mean of its divisors is an integer number (352430010).

Almost surely, 2^1331402243 is an apocalyptic number.

1331402243 is a deficient number, since it is larger than the sum of its proper divisors (78317797).

1331402243 is an equidigital number, since it uses as much as digits as its factorization.

1331402243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78317796.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 1331402243 is about 36488.3850423666. The cubic root of 1331402243 is about 1100.1107995829.

Adding to 1331402243 its reverse (3422041331), we get a palindrome (4753443574).

The spelling of 1331402243 in words is "one billion, three hundred thirty-one million, four hundred two thousand, two hundred forty-three".