2156209226 has 4 divisors (see below), whose sum is σ = 3234313842. Its totient is φ = 1078104612.

The previous prime is 2156209199. The next prime is 2156209241. The reversal of 2156209226 is 6229026512.

It is a Cunningham number, because it is equal to 46435²+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., 2156209225 + 1 = 46435^2 + 1^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 539052305 + ... + 539052308.

Almost surely, 2^2156209226 is an apocalyptic number.

2156209226 is a deficient number, since it is larger than the sum of its proper divisors (1078104616).

2156209226 is a wasteful number, since it uses less digits than its factorization.

2156209226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078104615.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 2156209226 is about 46435.0000107677. Note that the first 4 decimals coincide. The cubic root of 2156209226 is about 1291.9041698229.

The spelling of 2156209226 in words is "two billion, one hundred fifty-six million, two hundred nine thousand, two hundred twenty-six".