153168989 has 4 divisors (see below), whose sum is σ = 156904860. Its totient is φ = 149433120.

The previous prime is 153168979. The next prime is 153168991. The reversal of 153168989 is 989861351.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 989861351 = 3761 ⋅263191.

It can be written as a sum of positive squares in 2 ways, for example, as 81631225 + 71537764 = 9035^2 + 8458^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-153168989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (153168949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1867874 + ... + 1867955.

It is an arithmetic number, because the mean of its divisors is an integer number (39226215).

Almost surely, 2^153168989 is an apocalyptic number.

It is an amenable number.

153168989 is a deficient number, since it is larger than the sum of its proper divisors (3735871).

153168989 is an equidigital number, since it uses as much as digits as its factorization.

153168989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3735870.

The product of its digits is 466560, while the sum is 50.

The square root of 153168989 is about 12376.1459671418. The cubic root of 153168989 is about 535.0449655047.

The spelling of 153168989 in words is "one hundred fifty-three million, one hundred sixty-eight thousand, nine hundred eighty-nine".