1917116825 has 12 divisors (see below), whose sum is σ = 2560088748. Its totient is φ = 1415716800.

The previous prime is 1917116821. The next prime is 1917116837. The reversal of 1917116825 is 5286117191.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 742889536 + 1174227289 = 27256^2 + 34267^2 .

It is not a de Polignac number, because 1917116825 - 2² = 1917116821 is a prime.

It is a super-3 number, since 3×1917116825³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1917116821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2949086 + ... + 2949735.

It is an arithmetic number, because the mean of its divisors is an integer number (213340729).

Almost surely, 2^1917116825 is an apocalyptic number.

It is an amenable number.

1917116825 is a deficient number, since it is larger than the sum of its proper divisors (642971923).

1917116825 is a wasteful number, since it uses less digits than its factorization.

1917116825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5898844 (or 5898839 counting only the distinct ones).

The product of its digits is 30240, while the sum is 41.

The square root of 1917116825 is about 43784.8926571711. The cubic root of 1917116825 is about 1242.2705591100.

The spelling of 1917116825 in words is "one billion, nine hundred seventeen million, one hundred sixteen thousand, eight hundred twenty-five".