5161821542249 has 4 divisors (see below), whose sum is σ = 5161884405840. Its totient is φ = 5161758678660.

The previous prime is 5161821542243. The next prime is 5161821542309. The reversal of 5161821542249 is 9422451281615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5161821542249 - 2⁸ = 5161821541993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 5161821542197 and 5161821542206.

It is not an unprimeable number, because it can be changed into a prime (5161821542243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31308467 + ... + 31472904.

It is an arithmetic number, because the mean of its divisors is an integer number (1290471101460).

Almost surely, 2^{5161821542249} is an apocalyptic number.

It is an amenable number.

5161821542249 is a deficient number, since it is larger than the sum of its proper divisors (62863591).

5161821542249 is an equidigital number, since it uses as much as digits as its factorization.

5161821542249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62863590.

The product of its digits is 1382400, while the sum is 50.

The spelling of 5161821542249 in words is "five trillion, one hundred sixty-one billion, eight hundred twenty-one million, five hundred forty-two thousand, two hundred forty-nine".