745609 has 2 divisors, whose sum is σ = 745610.
Its totient is φ = 745608.
The previous prime is 745601. The next prime is 745621. The reversal of 745609 is 906547.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 685584 + 60025 = 828^2 + 245^2
It is a cyclic number.
It is not a de Polignac number, because 745609 - 23 = 745601 is a prime.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (745601) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372804 + 372805.
It is an arithmetic number, because the mean of its divisors is an integer number (372805).
2745609 is an apocalyptic number.
It is an amenable number.
745609 is a deficient number, since it is larger than the sum of its proper divisors (1).
745609 is an equidigital number, since it uses as much as digits as its factorization.
745609 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 7560, while the sum is 31.
The square root of 745609 is about 863.4865372431.
The cubic root of 745609 is about 90.6783718908.
The spelling of 745609 in words is "seven hundred forty-five thousand, six hundred nine".