561351 has 8 divisors (see below), whose sum is σ = 855424. Its totient is φ = 320760.

The previous prime is 561347. The next prime is 561359. The reversal of 561351 is 153165.

It is a happy number.

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

It is not a de Polignac number, because 561351 - 2² = 561347 is a prime.

It is a super-2 number, since 2×561351² = 630229890402, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 26731 = 561351 / (5 + 6 + 1 + 3 + 5 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561359) 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, 13345 + ... + 13386.

It is an arithmetic number, because the mean of its divisors is an integer number (106928).

2⁵⁶¹³⁵¹ is an apocalyptic number.

561351 is a deficient number, since it is larger than the sum of its proper divisors (294073).

561351 is a wasteful number, since it uses less digits than its factorization.

561351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26741.

The product of its digits is 450, while the sum is 21.

The square root of 561351 is about 749.2336084293. The cubic root of 561351 is about 82.4919367693.

The spelling of 561351 in words is "five hundred sixty-one thousand, three hundred fifty-one".