811623122 has 4 divisors (see below), whose sum is σ = 1217434686. Its totient is φ = 405811560.

The previous prime is 811623107. The next prime is 811623143. The reversal of 811623122 is 221326118.

It is a Cunningham number, because it is equal to 28489²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 811623121 + 1 = 28489^2 + 1^2 .

It is a junction number, because it is equal to n+sod(n) for n = 811623091 and 811623100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202905779 + ... + 202905782.

Almost surely, 2^811623122 is an apocalyptic number.

811623122 is a deficient number, since it is larger than the sum of its proper divisors (405811564).

811623122 is a wasteful number, since it uses less digits than its factorization.

811623122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405811563.

The product of its digits is 1152, while the sum is 26.

The square root of 811623122 is about 28489.0000175506. Note that the first 4 decimals coincide. The cubic root of 811623122 is about 932.7919804808.

The spelling of 811623122 in words is "eight hundred eleven million, six hundred twenty-three thousand, one hundred twenty-two".