43431613 has 4 divisors (see below), whose sum is σ = 45319968. Its totient is φ = 41543260.

The previous prime is 43431571. The next prime is 43431629. The reversal of 43431613 is 31613434.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43431613 - 2¹⁷ = 43300541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43431643) 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, 944143 + ... + 944188.

It is an arithmetic number, because the mean of its divisors is an integer number (11329992).

Almost surely, 2^43431613 is an apocalyptic number.

It is an amenable number.

43431613 is a deficient number, since it is larger than the sum of its proper divisors (1888355).

43431613 is a wasteful number, since it uses less digits than its factorization.

43431613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1888354.

The product of its digits is 2592, while the sum is 25.

The square root of 43431613 is about 6590.2665348224. The cubic root of 43431613 is about 351.5080857992.

It can be divided in two parts, 43431 and 613, that added together give a palindrome (44044).

The spelling of 43431613 in words is "forty-three million, four hundred thirty-one thousand, six hundred thirteen".