43120231551 has 16 divisors (see below), whose sum is σ = 64038031200. Its totient is φ = 28676528064.

The previous prime is 43120231547. The next prime is 43120231589. The reversal of 43120231551 is 15513202134.

It is not a de Polignac number, because 43120231551 - 2² = 43120231547 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43120231591) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1941336 + ... + 1963421.

It is an arithmetic number, because the mean of its divisors is an integer number (4002376950).

Almost surely, 2^43120231551 is an apocalyptic number.

43120231551 is a deficient number, since it is larger than the sum of its proper divisors (20917799649).

43120231551 is a wasteful number, since it uses less digits than its factorization.

43120231551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3905175 (or 3905169 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 43120231551 its reverse (15513202134), we get a palindrome (58633433685).

The spelling of 43120231551 in words is "forty-three billion, one hundred twenty million, two hundred thirty-one thousand, five hundred fifty-one".