1331243145 has 48 divisors (see below), whose sum is σ = 2374444800. Its totient is φ = 689552640.

The previous prime is 1331243119. The next prime is 1331243159. The reversal of 1331243145 is 5413421331.

It is a happy number.

It is not a de Polignac number, because 1331243145 - 2¹¹ = 1331241097 is a prime.

It is a super-2 number, since 2×1331243145² = 3544416622218982050, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 439446 + ... + 442464.

It is an arithmetic number, because the mean of its divisors is an integer number (49467600).

Almost surely, 2^1331243145 is an apocalyptic number.

1331243145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1331243145 is a deficient number, since it is larger than the sum of its proper divisors (1043201655).

1331243145 is a wasteful number, since it uses less digits than its factorization.

1331243145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3310 (or 3307 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 1331243145 is about 36486.2048588230. The cubic root of 1331243145 is about 1100.0669780153.

Adding to 1331243145 its reverse (5413421331), we get a palindrome (6744664476).

The spelling of 1331243145 in words is "one billion, three hundred thirty-one million, two hundred forty-three thousand, one hundred forty-five".