2261906 has 4 divisors (see below), whose sum is σ = 3392862. Its totient is φ = 1130952.

The previous prime is 2261891. The next prime is 2261911. The reversal of 2261906 is 6091622.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6091622 = 2 ⋅3045811.

It can be written as a sum of positive squares in only one way, i.e., 2128681 + 133225 = 1459^2 + 365^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565475 + ... + 565478.

2^2261906 is an apocalyptic number.

2261906 is a deficient number, since it is larger than the sum of its proper divisors (1130956).

2261906 is a wasteful number, since it uses less digits than its factorization.

2261906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130955.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 2261906 is about 1503.9634304065. The cubic root of 2261906 is about 131.2677932037.

The spelling of 2261906 in words is "two million, two hundred sixty-one thousand, nine hundred six".