153440981 has 8 divisors (see below), whose sum is σ = 160574400. Its totient is φ = 146346112.

The previous prime is 153440977. The next prime is 153440993. The reversal of 153440981 is 189044351.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 153440981 - 2² = 153440977 is a prime.

It is a super-2 number, since 2×153440981² = 47088269300484722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (153440951) 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 7 ways as a sum of consecutive naturals, for example, 1331 + ... + 17568.

It is an arithmetic number, because the mean of its divisors is an integer number (20071800).

Almost surely, 2^153440981 is an apocalyptic number.

It is an amenable number.

153440981 is a deficient number, since it is larger than the sum of its proper divisors (7133419).

153440981 is a wasteful number, since it uses less digits than its factorization.

153440981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19275.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 153440981 is about 12387.1296513761. The cubic root of 153440981 is about 535.3614827819.

The spelling of 153440981 in words is "one hundred fifty-three million, four hundred forty thousand, nine hundred eighty-one".