2561098 has 4 divisors (see below), whose sum is σ = 3841650. Its totient is φ = 1280548.

The previous prime is 2561093. The next prime is 2561099. The reversal of 2561098 is 8901652.

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., 1671849 + 889249 = 1293^2 + 943^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (2561093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640273 + ... + 640276.

2^2561098 is an apocalyptic number.

2561098 is a deficient number, since it is larger than the sum of its proper divisors (1280552).

2561098 is a wasteful number, since it uses less digits than its factorization.

2561098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280551.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 2561098 is about 1600.3430882158. The cubic root of 2561098 is about 136.8176307885.

The spelling of 2561098 in words is "two million, five hundred sixty-one thousand, ninety-eight".