23901861436209 has 15 divisors (see below), whose sum is σ = 35705315529147. Its totient is φ = 15934544957088.

The previous prime is 23901861436199. The next prime is 23901861436217. The reversal of 23901861436209 is 90263416810932.

The square root of 23901861436209 is 4888953.

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

23901861436209 is a `hidden beast` number, since 2 + 3 + 9 + 0 + 1 + 8 + 6 + 1 + 4 + 3 + 620 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 23634911480625 + 266949955584 = 4861575^2 + 516672^2 .

It is not a de Polignac number, because 23901861436209 - 2¹³ = 23901861428017 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23901861636209) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 43728969 + ... + 44272185.

Almost surely, 2^{23901861436209} is an apocalyptic number.

23901861436209 is the 4888953-rd square number.

23901861436209 is the 2444477-th centered octagonal number.

It is an amenable number.

23901861436209 is a deficient number, since it is larger than the sum of its proper divisors (11803454092938).

23901861436209 is an frugal number, since it uses more digits than its factorization.

23901861436209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086446 (or 543220 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The spelling of 23901861436209 in words is "twenty-three trillion, nine hundred one billion, eight hundred sixty-one million, four hundred thirty-six thousand, two hundred nine".