43113551 has 4 divisors (see below), whose sum is σ = 46429992. Its totient is φ = 39797112.

The previous prime is 43113487. The next prime is 43113557. The reversal of 43113551 is 15531134.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15531134 = 2 ⋅7765567.

It is a cyclic number.

It is not a de Polignac number, because 43113551 - 2⁶ = 43113487 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 (43113557) 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, 1658201 + ... + 1658226.

It is an arithmetic number, because the mean of its divisors is an integer number (11607498).

Almost surely, 2^43113551 is an apocalyptic number.

43113551 is a deficient number, since it is larger than the sum of its proper divisors (3316441).

43113551 is a wasteful number, since it uses less digits than its factorization.

43113551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3316440.

The product of its digits is 900, while the sum is 23.

The square root of 43113551 is about 6566.0909984556. The cubic root of 43113551 is about 350.6479182044.

Adding to 43113551 its reverse (15531134), we get a palindrome (58644685).

The spelling of 43113551 in words is "forty-three million, one hundred thirteen thousand, five hundred fifty-one".