2391411723561 has 81 divisors (see below), whose sum is σ = 4048957886103. Its totient is φ = 1356147606240.

The previous prime is 2391411723551. The next prime is 2391411723577. The reversal of 2391411723561 is 1653271141932.

The square root of 2391411723561 is 1546419.

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

2391411723561 is a `hidden beast` number, since 2 + 3 + 9 + 1 + 4 + 11 + 72 + 3 + 561 = 666.

2391411723561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1755277867161 + 636133856400 = 1324869^2 + 797580^2 .

It is not a de Polignac number, because 2391411723561 - 2²⁵ = 2391378169129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2391411723521) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 6852182415 + ... + 6852182763.

Almost surely, 2^{2391411723561} is an apocalyptic number.

2391411723561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2391411723561 is the 1546419-th square number.

2391411723561 is the 773210-th centered octagonal number.

It is an amenable number.

2391411723561 is a deficient number, since it is larger than the sum of its proper divisors (1657546162542).

2391411723561 is an frugal number, since it uses more digits than its factorization.

2391411723561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140 (or 570 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The spelling of 2391411723561 in words is "two trillion, three hundred ninety-one billion, four hundred eleven million, seven hundred twenty-three thousand, five hundred sixty-one".