1911001225 has 27 divisors (see below), whose sum is σ = 2758730517. Its totient is φ = 1309351680.

The previous prime is 1911001199. The next prime is 1911001237. The reversal of 1911001225 is 5221001191.

The square root of 1911001225 is 43715.

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

It can be written as a sum of positive squares in 4 ways, for example, as 102030201 + 1808971024 = 10101^2 + 42532^2 .

It is not a de Polignac number, because 1911001225 - 2²¹ = 1908904073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1911001196 and 1911001205.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1529401 + ... + 1530649.

Almost surely, 2^1911001225 is an apocalyptic number.

1911001225 is the 43715-th square number.

1911001225 is the 21858-th centered octagonal number.

It is an amenable number.

1911001225 is a deficient number, since it is larger than the sum of its proper divisors (847729292).

1911001225 is an frugal number, since it uses more digits than its factorization.

1911001225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2522 (or 1261 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 22.

The cubic root of 1911001225 is about 1240.9482048915.

The spelling of 1911001225 in words is "one billion, nine hundred eleven million, one thousand, two hundred twenty-five".