1645253 has 2 divisors, whose sum is σ = 1645254. Its totient is φ = 1645252.

The previous prime is 1645249. The next prime is 1645291. The reversal of 1645253 is 3525461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1329409 + 315844 = 1153^2 + 562^2 .

It is an emirp because it is prime and its reverse (3525461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1645253 - 2² = 1645249 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822626 + 822627.

It is an arithmetic number, because the mean of its divisors is an integer number (822627).

2^1645253 is an apocalyptic number.

It is an amenable number.

1645253 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645253 is an equidigital number, since it uses as much as digits as its factorization.

1645253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 26.

The square root of 1645253 is about 1282.6741597148. The cubic root of 1645253 is about 118.0531456476.

The spelling of 1645253 in words is "one million, six hundred forty-five thousand, two hundred fifty-three".