105915491897 has 4 divisors (see below), whose sum is σ = 105917130276. Its totient is φ = 105913853520.

The previous prime is 105915491893. The next prime is 105915491917. The reversal of 105915491897 is 798194519501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 798194519501 = 71 ⋅11242176331.

It can be written as a sum of positive squares in 2 ways, for example, as 78371442601 + 27544049296 = 279949^2 + 165964^2 .

It is a cyclic number.

It is not a de Polignac number, because 105915491897 - 2² = 105915491893 is a prime.

It is a super-2 number, since 2×105915491897² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105915491893) 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, 718058 + ... + 852899.

It is an arithmetic number, because the mean of its divisors is an integer number (26479282569).

Almost surely, 2^105915491897 is an apocalyptic number.

It is an amenable number.

105915491897 is a deficient number, since it is larger than the sum of its proper divisors (1638379).

105915491897 is an equidigital number, since it uses as much as digits as its factorization.

105915491897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638378.

The product of its (nonzero) digits is 4082400, while the sum is 59.

The spelling of 105915491897 in words is "one hundred five billion, nine hundred fifteen million, four hundred ninety-one thousand, eight hundred ninety-seven".