9905195123 has 4 divisors (see below), whose sum is σ = 9907333128. Its totient is φ = 9903057120.

The previous prime is 9905195107. The next prime is 9905195141. The reversal of 9905195123 is 3215915099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3215915099 = 5387 ⋅596977.

It is a cyclic number.

It is not a de Polignac number, because 9905195123 - 2⁴ = 9905195107 is a prime.

It is a super-2 number, since 2×9905195123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9905195173) 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, 1062038 + ... + 1071323.

It is an arithmetic number, because the mean of its divisors is an integer number (2476833282).

Almost surely, 2^9905195123 is an apocalyptic number.

9905195123 is a deficient number, since it is larger than the sum of its proper divisors (2138005).

9905195123 is a wasteful number, since it uses less digits than its factorization.

9905195123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2138004.

The product of its (nonzero) digits is 109350, while the sum is 44.

The square root of 9905195123 is about 99524.8467620021. The cubic root of 9905195123 is about 2147.6046965933.

The spelling of 9905195123 in words is "nine billion, nine hundred five million, one hundred ninety-five thousand, one hundred twenty-three".