1645461 has 8 divisors (see below), whose sum is σ = 2437760. Its totient is φ = 1096956.

The previous prime is 1645459. The next prime is 1645463.

1645461 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (1645459) and next prime (1645463).

It is not a de Polignac number, because 1645461 - 2¹ = 1645459 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 60943 = 1645461 / (1 + 6 + 4 + 5 + 4 + 6 + 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 (1645463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30445 + ... + 30498.

It is an arithmetic number, because the mean of its divisors is an integer number (304720).

2^1645461 is an apocalyptic number.

It is an amenable number.

1645461 is a deficient number, since it is larger than the sum of its proper divisors (792299).

1645461 is an equidigital number, since it uses as much as digits as its factorization.

1645461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60952 (or 60946 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 1645461 is about 1282.7552377597. The cubic root of 1645461 is about 118.0581203677.

It can be divided in two parts, 164 and 5461, that added together give a square (5625 = 75²).

The spelling of 1645461 in words is "one million, six hundred forty-five thousand, four hundred sixty-one".