2561487 has 8 divisors (see below), whose sum is σ = 3563904. Its totient is φ = 1633368.

The previous prime is 2561431. The next prime is 2561491. The reversal of 2561487 is 7841652.

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

It is not a de Polignac number, because 2561487 - 2⁶ = 2561423 is a prime.

It is a super-2 number, since 2×2561487² = 13122431302338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18493 + ... + 18630.

It is an arithmetic number, because the mean of its divisors is an integer number (445488).

2^2561487 is an apocalyptic number.

2561487 is a deficient number, since it is larger than the sum of its proper divisors (1002417).

2561487 is a wasteful number, since it uses less digits than its factorization.

2561487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37149.

The product of its digits is 13440, while the sum is 33.

The square root of 2561487 is about 1600.4646200401. The cubic root of 2561487 is about 136.8245574223.

The spelling of 2561487 in words is "two million, five hundred sixty-one thousand, four hundred eighty-seven".