2261618 has 4 divisors (see below), whose sum is σ = 3392430. Its totient is φ = 1130808.

The previous prime is 2261617. The next prime is 2261621. The reversal of 2261618 is 8161622.

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., 2181529 + 80089 = 1477^2 + 283^2 .

It is a super-2 number, since 2×2261618² = 10229831955848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2261617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565403 + ... + 565406.

2^2261618 is an apocalyptic number.

2261618 is a deficient number, since it is larger than the sum of its proper divisors (1130812).

2261618 is a wasteful number, since it uses less digits than its factorization.

2261618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130811.

The product of its digits is 1152, while the sum is 26.

The square root of 2261618 is about 1503.8676803496. The cubic root of 2261618 is about 131.2622216888.

The spelling of 2261618 in words is "two million, two hundred sixty-one thousand, six hundred eighteen".