2561330 has 8 divisors (see below), whose sum is σ = 4610412. Its totient is φ = 1024528.

The previous prime is 2561327. The next prime is 2561341. The reversal of 2561330 is 331652.

2561330 = 923² + 924² + 925².

It can be written as a sum of positive squares in 2 ways, for example, as 2436721 + 124609 = 1561^2 + 353^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×2561330² = 13120822737800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128057 + ... + 128076.

2^2561330 is an apocalyptic number.

2561330 is a deficient number, since it is larger than the sum of its proper divisors (2049082).

2561330 is a wasteful number, since it uses less digits than its factorization.

2561330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256140.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 2561330 is about 1600.4155710315. The cubic root of 2561330 is about 136.8217619245.

Adding to 2561330 its reverse (331652), we get a palindrome (2892982).

The spelling of 2561330 in words is "two million, five hundred sixty-one thousand, three hundred thirty".