1145431405 has 16 divisors (see below), whose sum is σ = 1400929200. Its totient is φ = 898905600.

The previous prime is 1145431373. The next prime is 1145431409. The reversal of 1145431405 is 5041345411.

It can be written as a sum of positive squares in 8 ways, for example, as 42328036 + 1103103369 = 6506^2 + 33213^2 .

It is not a de Polignac number, because 1145431405 - 2⁵ = 1145431373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145431409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44641 + ... + 65449.

It is an arithmetic number, because the mean of its divisors is an integer number (87558075).

Almost surely, 2^1145431405 is an apocalyptic number.

It is an amenable number.

1145431405 is a deficient number, since it is larger than the sum of its proper divisors (255497795).

1145431405 is a wasteful number, since it uses less digits than its factorization.

1145431405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21024.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 1145431405 is about 33844.2226236621. Note that the first 3 decimals coincide. The cubic root of 1145431405 is about 1046.3003294995.

Adding to 1145431405 its reverse (5041345411), we get a palindrome (6186776816).

The spelling of 1145431405 in words is "one billion, one hundred forty-five million, four hundred thirty-one thousand, four hundred five".