812193001 has 3 divisors (see below), whose sum is σ = 812221501. Its totient is φ = 812164502.

The previous prime is 812192993. The next prime is 812193013. The reversal of 812193001 is 100391218.

The square root of 812193001 is 28499.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 100391218 = 2 ⋅50195609.

It is not a de Polignac number, because 812193001 - 2³ = 812192993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812193301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 14250 + ... + 42748.

Almost surely, 2^812193001 is an apocalyptic number.

812193001 is the 28499-th square number.

812193001 is the 14250-th centered octagonal number.

It is an amenable number.

812193001 is a deficient number, since it is larger than the sum of its proper divisors (28500).

812193001 is an frugal number, since it uses more digits than its factorization.

812193001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56998 (or 28499 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 25.

The cubic root of 812193001 is about 933.0102485331.

Multiplying 812193001 by its sum of digits (25), we get a square (20304825025 = 142495²).

The spelling of 812193001 in words is "eight hundred twelve million, one hundred ninety-three thousand, one".