812209137 has 4 divisors (see below), whose sum is σ = 1082945520. Its totient is φ = 541472756.

The previous prime is 812209129. The next prime is 812209141. The reversal of 812209137 is 731902218.

812209137 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 812209137 - 2³ = 812209129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 812209098 and 812209107.

It is not an unprimeable number, because it can be changed into a prime (812209127) 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, 135368187 + ... + 135368192.

It is an arithmetic number, because the mean of its divisors is an integer number (270736380).

Almost surely, 2^812209137 is an apocalyptic number.

It is an amenable number.

812209137 is a deficient number, since it is larger than the sum of its proper divisors (270736383).

812209137 is a wasteful number, since it uses less digits than its factorization.

812209137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270736382.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 812209137 is about 28499.2830962465. The cubic root of 812209137 is about 933.0164272590.

The spelling of 812209137 in words is "eight hundred twelve million, two hundred nine thousand, one hundred thirty-seven".