2812172906 has 4 divisors (see below), whose sum is σ = 4218259362. Its totient is φ = 1406086452.

The previous prime is 2812172893. The next prime is 2812172911. The reversal of 2812172906 is 6092712182.

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., 1769464225 + 1042708681 = 42065^2 + 32291^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2812172906.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 703043225 + ... + 703043228.

Almost surely, 2^2812172906 is an apocalyptic number.

2812172906 is a deficient number, since it is larger than the sum of its proper divisors (1406086456).

2812172906 is a wasteful number, since it uses less digits than its factorization.

2812172906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406086455.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 2812172906 is about 53029.9246275157. The cubic root of 2812172906 is about 1411.4993199131.

The spelling of 2812172906 in words is "two billion, eight hundred twelve million, one hundred seventy-two thousand, nine hundred six".