561465 has 16 divisors (see below), whose sum is σ = 998400. Its totient is φ = 299376.

The previous prime is 561461. The next prime is 561521. The reversal of 561465 is 564165.

It is a happy number.

It is not a de Polignac number, because 561465 - 2² = 561461 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

561465 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (561461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1945 + ... + 2214.

It is an arithmetic number, because the mean of its divisors is an integer number (62400).

2⁵⁶¹⁴⁶⁵ is an apocalyptic number.

It is an amenable number.

561465 is a deficient number, since it is larger than the sum of its proper divisors (436935).

561465 is a wasteful number, since it uses less digits than its factorization.

561465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4173 (or 4167 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 561465 is about 749.3096823077. The cubic root of 561465 is about 82.4975205866.

It can be divided in two parts, 56 and 1465, that added together give a square (1521 = 39²).

The spelling of 561465 in words is "five hundred sixty-one thousand, four hundred sixty-five".