145656709 has 4 divisors (see below), whose sum is σ = 158898240. Its totient is φ = 132415180.

The previous prime is 145656701. The next prime is 145656733. The reversal of 145656709 is 907656541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 907656541 = 11 ⋅82514231.

It is a cyclic number.

It is not a de Polignac number, because 145656709 - 2³ = 145656701 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145656701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6620749 + ... + 6620770.

It is an arithmetic number, because the mean of its divisors is an integer number (39724560).

Almost surely, 2^145656709 is an apocalyptic number.

It is an amenable number.

145656709 is a deficient number, since it is larger than the sum of its proper divisors (13241531).

145656709 is a wasteful number, since it uses less digits than its factorization.

145656709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13241530.

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 145656709 is about 12068.8321307407. The cubic root of 145656709 is about 526.1507143766.

The spelling of 145656709 in words is "one hundred forty-five million, six hundred fifty-six thousand, seven hundred nine".