43790790086521 has 9 divisors (see below), whose sum is σ = 43824969454149. Its totient is φ = 43756637370300.

The previous prime is 43790790086509. The next prime is 43790790086539. The reversal of 43790790086521 is 12568009709734.

The square root of 43790790086521 is 6617461.

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

It is not a de Polignac number, because 43790790086521 - 2¹⁵ = 43790790053753 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43790790086521.

It is not an unprimeable number, because it can be changed into a prime (43790790086581) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 15689998636 + ... + 15690001426.

It is an arithmetic number, because the mean of its divisors is an integer number (4869441050461).

It is a 1-persistent number, because it is pandigital, but 2⋅43790790086521 = 87581580173042 is not.

Almost surely, 2^{43790790086521} is an apocalyptic number.

43790790086521 is the 6617461-st square number.

43790790086521 is the 3308731-st centered octagonal number.

It is an amenable number.

43790790086521 is a deficient number, since it is larger than the sum of its proper divisors (34179367628).

43790790086521 is an frugal number, since it uses more digits than its factorization.

43790790086521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10324 (or 5162 counting only the distinct ones).

The product of its (nonzero) digits is 22861440, while the sum is 61.

The spelling of 43790790086521 in words is "forty-three trillion, seven hundred ninety billion, seven hundred ninety million, eighty-six thousand, five hundred twenty-one".