153688945 has 4 divisors (see below), whose sum is σ = 184426740. Its totient is φ = 122951152.

The previous prime is 153688937. The next prime is 153688961. The reversal of 153688945 is 549886351.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 549886351 = 7 ⋅78555193.

It can be written as a sum of positive squares in 2 ways, for example, as 119443041 + 34245904 = 10929^2 + 5852^2 .

It is a cyclic number.

It is not a de Polignac number, because 153688945 - 2³ = 153688937 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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, 15368890 + ... + 15368899.

It is an arithmetic number, because the mean of its divisors is an integer number (46106685).

Almost surely, 2^153688945 is an apocalyptic number.

It is an amenable number.

153688945 is a deficient number, since it is larger than the sum of its proper divisors (30737795).

153688945 is an equidigital number, since it uses as much as digits as its factorization.

153688945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30737794.

The product of its digits is 1036800, while the sum is 49.

The square root of 153688945 is about 12397.1345479510. The cubic root of 153688945 is about 535.6497128857.

The spelling of 153688945 in words is "one hundred fifty-three million, six hundred eighty-eight thousand, nine hundred forty-five".