153112721 has 8 divisors (see below), whose sum is σ = 159062400. Its totient is φ = 147207760.

The previous prime is 153112703. The next prime is 153112747. The reversal of 153112721 is 127211351.

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 153112721 - 2²⁶ = 86003857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (153142721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4115 + ... + 17976.

It is an arithmetic number, because the mean of its divisors is an integer number (19882800).

Almost surely, 2^153112721 is an apocalyptic number.

It is an amenable number.

153112721 is a deficient number, since it is larger than the sum of its proper divisors (5949679).

153112721 is a wasteful number, since it uses less digits than its factorization.

153112721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22359.

The product of its digits is 420, while the sum is 23.

The square root of 153112721 is about 12373.8725142940. The cubic root of 153112721 is about 534.9794396268.

The spelling of 153112721 in words is "one hundred fifty-three million, one hundred twelve thousand, seven hundred twenty-one".