816121733 has 4 divisors (see below), whose sum is σ = 932710560. Its totient is φ = 699532908.

The previous prime is 816121697. The next prime is 816121751. The reversal of 816121733 is 337121618.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 337121618 = 2 ⋅168560809.

It is a cyclic number.

It is not a de Polignac number, because 816121733 - 2¹⁸ = 815859589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 816121733.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816121753) 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, 58294403 + ... + 58294416.

It is an arithmetic number, because the mean of its divisors is an integer number (233177640).

Almost surely, 2^816121733 is an apocalyptic number.

It is an amenable number.

816121733 is a deficient number, since it is larger than the sum of its proper divisors (116588827).

816121733 is a wasteful number, since it uses less digits than its factorization.

816121733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116588826.

The product of its digits is 6048, while the sum is 32.

The square root of 816121733 is about 28567.8443884028. The cubic root of 816121733 is about 934.5122120364.

The spelling of 816121733 in words is "eight hundred sixteen million, one hundred twenty-one thousand, seven hundred thirty-three".