431440145 has 4 divisors (see below), whose sum is σ = 517728180. Its totient is φ = 345152112.

The previous prime is 431440123. The next prime is 431440151. The reversal of 431440145 is 541044134.

It is a happy number.

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 148157584 + 283282561 = 12172^2 + 16831^2 .

It is a cyclic number.

It is not a de Polignac number, because 431440145 - 2⁶ = 431440081 is a prime.

It is a super-2 number, since 2×431440145² = 372281197435242050, 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, 43144010 + ... + 43144019.

It is an arithmetic number, because the mean of its divisors is an integer number (129432045).

Almost surely, 2^431440145 is an apocalyptic number.

It is an amenable number.

431440145 is a deficient number, since it is larger than the sum of its proper divisors (86288035).

431440145 is an equidigital number, since it uses as much as digits as its factorization.

431440145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86288034.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 431440145 is about 20771.1373063682. The cubic root of 431440145 is about 755.6259271448.

Adding to 431440145 its reverse (541044134), we get a palindrome (972484279).

The spelling of 431440145 in words is "four hundred thirty-one million, four hundred forty thousand, one hundred forty-five".