153685609 has 45 divisors (see below), whose sum is σ = 206010749. Its totient is φ = 114548280.

The previous prime is 153685601. The next prime is 153685613. The reversal of 153685609 is 906586351.

The square root of 153685609 is 12397.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 153685609 - 2³ = 153685601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (153685601) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 6681972 + ... + 6681994.

Almost surely, 2^153685609 is an apocalyptic number.

153685609 is the 12397-th square number.

153685609 is the 6199-th centered octagonal number.

It is an amenable number.

153685609 is a deficient number, since it is larger than the sum of its proper divisors (52325140).

153685609 is an frugal number, since it uses more digits than its factorization.

153685609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 43.

The cubic root of 153685609 is about 535.6458372212.

The spelling of 153685609 in words is "one hundred fifty-three million, six hundred eighty-five thousand, six hundred nine".