816634949 has 8 divisors (see below), whose sum is σ = 888520920. Its totient is φ = 746044416.

The previous prime is 816634921. The next prime is 816634981. The reversal of 816634949 is 949436618.

It can be written as a sum of positive squares in 4 ways, for example, as 1932100 + 814702849 = 1390^2 + 28543^2 .

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-816634949 is a prime.

It is a super-3 number, since 3×816634949³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 816634897 and 816634906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816634549) 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, 322544 + ... + 325065.

It is an arithmetic number, because the mean of its divisors is an integer number (111065115).

Almost surely, 2^816634949 is an apocalyptic number.

It is an amenable number.

816634949 is a deficient number, since it is larger than the sum of its proper divisors (71885971).

816634949 is a wasteful number, since it uses less digits than its factorization.

816634949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647719.

The product of its digits is 1119744, while the sum is 50.

The square root of 816634949 is about 28576.8253835166. The cubic root of 816634949 is about 934.7080595029.

The spelling of 816634949 in words is "eight hundred sixteen million, six hundred thirty-four thousand, nine hundred forty-nine".