1145431345 has 4 divisors (see below), whose sum is σ = 1374517620. Its totient is φ = 916345072.

The previous prime is 1145431333. The next prime is 1145431351. The reversal of 1145431345 is 5431345411.

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

It can be written as a sum of positive squares in 2 ways, for example, as 758286369 + 387144976 = 27537^2 + 19676^2 .

It is a cyclic number.

It is not a de Polignac number, because 1145431345 - 2²³ = 1137042737 is a prime.

It is a super-2 number, since 2×1145431345² = 2624025932217018050, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 114543130 + ... + 114543139.

It is an arithmetic number, because the mean of its divisors is an integer number (343629405).

Almost surely, 2^1145431345 is an apocalyptic number.

It is an amenable number.

1145431345 is a deficient number, since it is larger than the sum of its proper divisors (229086275).

1145431345 is an equidigital number, since it uses as much as digits as its factorization.

1145431345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229086274.

The product of its digits is 14400, while the sum is 31.

The square root of 1145431345 is about 33844.2217372479. The cubic root of 1145431345 is about 1046.3003112304.

Adding to 1145431345 its reverse (5431345411), we get a palindrome (6576776756).

The spelling of 1145431345 in words is "one billion, one hundred forty-five million, four hundred thirty-one thousand, three hundred forty-five".