43013515623961 has 3 divisors (see below), whose sum is σ = 43013522182431. Its totient is φ = 43013509065492.

The previous prime is 43013515623943. The next prime is 43013515624111. The reversal of 43013515623961 is 16932651531034.

The square root of 43013515623961 is 6558469.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 30962758807561 + 12050756816400 = 5564419^2 + 3471420^2 .

It is not a de Polignac number, because 43013515623961 - 2³¹ = 43011368140313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43013515623931) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3279235 + ... + 9837703.

It is an arithmetic number, because the mean of its divisors is an integer number (14337840727477).

Almost surely, 2^{43013515623961} is an apocalyptic number.

43013515623961 is the 6558469-th square number.

43013515623961 is the 3279235-th centered octagonal number.

It is an amenable number.

43013515623961 is a deficient number, since it is larger than the sum of its proper divisors (6558470).

43013515623961 is an frugal number, since it uses more digits than its factorization.

43013515623961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13116938 (or 6558469 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 49.

The spelling of 43013515623961 in words is "forty-three trillion, thirteen billion, five hundred fifteen million, six hundred twenty-three thousand, nine hundred sixty-one".