43551098721 has 27 divisors (see below), whose sum is σ = 68131117587. Its totient is φ = 26795667600.

The previous prime is 43551098711. The next prime is 43551098737. The reversal of 43551098721 is 12789015534.

The square root of 43551098721 is 208689.

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

43551098721 is a `hidden beast` number, since 4 + 3 + 551 + 0 + 98 + 7 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6442470225 + 37108628496 = 80265^2 + 192636^2 .

It is not a de Polignac number, because 43551098721 - 2²¹ = 43549001569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43551098711) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 8136196 + ... + 8141546.

Almost surely, 2^43551098721 is an apocalyptic number.

43551098721 is the 208689-th square number.

43551098721 is the 104345-th centered octagonal number.

It is an amenable number.

43551098721 is a deficient number, since it is larger than the sum of its proper divisors (24580018866).

43551098721 is an frugal number, since it uses more digits than its factorization.

43551098721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10734 (or 5367 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 43551098721 in words is "forty-three billion, five hundred fifty-one million, ninety-eight thousand, seven hundred twenty-one".