43121431 has 8 divisors (see below), whose sum is σ = 45457280. Its totient is φ = 40792248.

The previous prime is 43121423. The next prime is 43121459. The reversal of 43121431 is 13412134.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 43121431 - 2³ = 43121423 is a prime.

It is a super-2 number, since 2×43121431² = 3718915622975522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43121399 and 43121408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43121471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17200 + ... + 19546.

It is an arithmetic number, because the mean of its divisors is an integer number (5682160).

Almost surely, 2^43121431 is an apocalyptic number.

43121431 is a deficient number, since it is larger than the sum of its proper divisors (2335849).

43121431 is a wasteful number, since it uses less digits than its factorization.

43121431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3333.

The product of its digits is 288, while the sum is 19.

The square root of 43121431 is about 6566.6910236435. The cubic root of 43121431 is about 350.6692799124.

Adding to 43121431 its reverse (13412134), we get a palindrome (56533565).

The spelling of 43121431 in words is "forty-three million, one hundred twenty-one thousand, four hundred thirty-one".