1921716485 has 8 divisors (see below), whose sum is σ = 2483449080. Its totient is φ = 1419113664.

The previous prime is 1921716481. The next prime is 1921716521. The reversal of 1921716485 is 5846171291.

It can be written as a sum of positive squares in 4 ways, for example, as 27552001 + 1894164484 = 5249^2 + 43522^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1921716485 - 2² = 1921716481 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921716481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14782370 + ... + 14782499.

It is an arithmetic number, because the mean of its divisors is an integer number (310431135).

Almost surely, 2^1921716485 is an apocalyptic number.

It is an amenable number.

1921716485 is a deficient number, since it is larger than the sum of its proper divisors (561732595).

1921716485 is a wasteful number, since it uses less digits than its factorization.

1921716485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29564887.

The product of its digits is 120960, while the sum is 44.

The square root of 1921716485 is about 43837.3868404585. The cubic root of 1921716485 is about 1243.2632752554.

The spelling of 1921716485 in words is "one billion, nine hundred twenty-one million, seven hundred sixteen thousand, four hundred eighty-five".