1445631709 has 4 divisors (see below), whose sum is σ = 1446035004. Its totient is φ = 1445228416.

The previous prime is 1445631689. The next prime is 1445631721. The reversal of 1445631709 is 9071365441.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45225625 + 1400406084 = 6725^2 + 37422^2 .

It is a cyclic number.

It is not a de Polignac number, because 1445631709 - 2¹⁵ = 1445598941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1445631409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196222 + ... + 203455.

It is an arithmetic number, because the mean of its divisors is an integer number (361508751).

Almost surely, 2^1445631709 is an apocalyptic number.

It is an amenable number.

1445631709 is a deficient number, since it is larger than the sum of its proper divisors (403295).

1445631709 is an equidigital number, since it uses as much as digits as its factorization.

1445631709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403294.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 1445631709 is about 38021.4637934943. The cubic root of 1445631709 is about 1130.7134422240.

The spelling of 1445631709 in words is "one billion, four hundred forty-five million, six hundred thirty-one thousand, seven hundred nine".