2145440431 has 4 divisors (see below), whose sum is σ = 2146487512. Its totient is φ = 2144393352.

The previous prime is 2145440417. The next prime is 2145440447. The reversal of 2145440431 is 1340445412.

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 2145440431 - 2⁵ = 2145440399 is a prime.

It is a super-2 number, since 2×2145440431² = 9205829285938931522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2145440431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145440411) 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, 520461 + ... + 524566.

It is an arithmetic number, because the mean of its divisors is an integer number (536621878).

Almost surely, 2^2145440431 is an apocalyptic number.

2145440431 is a deficient number, since it is larger than the sum of its proper divisors (1047081).

2145440431 is a wasteful number, since it uses less digits than its factorization.

2145440431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047080.

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 2145440431 is about 46318.8992852809. The cubic root of 2145440431 is about 1289.7498525440.

Adding to 2145440431 its reverse (1340445412), we get a palindrome (3485885843).

The spelling of 2145440431 in words is "two billion, one hundred forty-five million, four hundred forty thousand, four hundred thirty-one".