5661249 has 8 divisors (see below), whose sum is σ = 8234592. Its totient is φ = 3431040.

The previous prime is 5661247. The next prime is 5661277. The reversal of 5661249 is 9421665.

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

It is not a de Polignac number, because 5661249 - 2¹ = 5661247 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 171553 = 5661249 / (5 + 6 + 6 + 1 + 2 + 4 + 9).

5661249 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (5661247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85744 + ... + 85809.

It is an arithmetic number, because the mean of its divisors is an integer number (1029324).

Almost surely, 2^5661249 is an apocalyptic number.

It is an amenable number.

5661249 is a deficient number, since it is larger than the sum of its proper divisors (2573343).

5661249 is a wasteful number, since it uses less digits than its factorization.

5661249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171567.

The product of its digits is 12960, while the sum is 33.

The square root of 5661249 is about 2379.3379331234. The cubic root of 5661249 is about 178.2258736731.

The spelling of 5661249 in words is "five million, six hundred sixty-one thousand, two hundred forty-nine".