811225133 has 4 divisors (see below), whose sum is σ = 814799040. Its totient is φ = 807651228.

The previous prime is 811225117. The next prime is 811225141. The reversal of 811225133 is 331522118.

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: 331522118 = 2 ⋅165761059.

It is a cyclic number.

It is not a de Polignac number, because 811225133 - 2⁴ = 811225117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811227133) 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, 1786613 + ... + 1787066.

It is an arithmetic number, because the mean of its divisors is an integer number (203699760).

Almost surely, 2^811225133 is an apocalyptic number.

It is an amenable number.

811225133 is a deficient number, since it is larger than the sum of its proper divisors (3573907).

811225133 is a wasteful number, since it uses less digits than its factorization.

811225133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3573906.

The product of its digits is 1440, while the sum is 26.

The square root of 811225133 is about 28482.0142019486. The cubic root of 811225133 is about 932.6394870247.

The spelling of 811225133 in words is "eight hundred eleven million, two hundred twenty-five thousand, one hundred thirty-three".