43251020413 has 4 divisors (see below), whose sum is σ = 44742434940. Its totient is φ = 41759605888.

The previous prime is 43251020399. The next prime is 43251020429. The reversal of 43251020413 is 31402015234.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31402015234 = 2 ⋅15701007617.

It can be written as a sum of positive squares in 2 ways, for example, as 27973566009 + 15277454404 = 167253^2 + 123602^2 .

It is a cyclic number.

It is not a de Polignac number, because 43251020413 - 2⁹ = 43251019901 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 (43251020213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 745707220 + ... + 745707277.

It is an arithmetic number, because the mean of its divisors is an integer number (11185608735).

Almost surely, 2^43251020413 is an apocalyptic number.

It is an amenable number.

43251020413 is a deficient number, since it is larger than the sum of its proper divisors (1491414527).

43251020413 is a wasteful number, since it uses less digits than its factorization.

43251020413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1491414526.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 43251020413 its reverse (31402015234), we get a palindrome (74653035647).

The spelling of 43251020413 in words is "forty-three billion, two hundred fifty-one million, twenty thousand, four hundred thirteen".