1981716269 has 8 divisors (see below), whose sum is σ = 2174423832. Its totient is φ = 1794761280.

The previous prime is 1981716257. The next prime is 1981716301. The reversal of 1981716269 is 9626171891.

It can be written as a sum of positive squares in 4 ways, for example, as 281803369 + 1699912900 = 16787^2 + 41230^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-1981716269 is a prime.

It is a super-2 number, since 2×1981716269² = 7854398741638560722, which 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 (1981716229) 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, 1437422 + ... + 1438799.

It is an arithmetic number, because the mean of its divisors is an integer number (271802979).

Almost surely, 2^1981716269 is an apocalyptic number.

It is an amenable number.

1981716269 is a deficient number, since it is larger than the sum of its proper divisors (192707563).

1981716269 is a wasteful number, since it uses less digits than its factorization.

1981716269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2876287.

The product of its digits is 326592, while the sum is 50.

The square root of 1981716269 is about 44516.4718840117. The cubic root of 1981716269 is about 1256.0699475985.

The spelling of 1981716269 in words is "one billion, nine hundred eighty-one million, seven hundred sixteen thousand, two hundred sixty-nine".