99127461781 has 4 divisors (see below), whose sum is σ = 99193858092. Its totient is φ = 99061065472.

The previous prime is 99127461761. The next prime is 99127461809. The reversal of 99127461781 is 18716472199.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44480919025 + 54646542756 = 210905^2 + 233766^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99127461781 is a prime.

It is a super-2 number, since 2×99127461781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99127461761) 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, 33195916 + ... + 33198901.

It is an arithmetic number, because the mean of its divisors is an integer number (24798464523).

Almost surely, 2^99127461781 is an apocalyptic number.

It is an amenable number.

99127461781 is a deficient number, since it is larger than the sum of its proper divisors (66396311).

99127461781 is a wasteful number, since it uses less digits than its factorization.

99127461781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66396310.

The product of its digits is 1524096, while the sum is 55.

The spelling of 99127461781 in words is "ninety-nine billion, one hundred twenty-seven million, four hundred sixty-one thousand, seven hundred eighty-one".