153125721 has 56 divisors (see below), whose sum is σ = 269804864. Its totient is φ = 85030560.

The previous prime is 153125719. The next prime is 153125737. The reversal of 153125721 is 127521351.

It is not a de Polignac number, because 153125721 - 2¹ = 153125719 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (153125761) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 188406 + ... + 189216.

It is an arithmetic number, because the mean of its divisors is an integer number (4817944).

Almost surely, 2^153125721 is an apocalyptic number.

It is an amenable number.

153125721 is a deficient number, since it is larger than the sum of its proper divisors (116679143).

153125721 is an frugal number, since it uses more digits than its factorization.

153125721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873 (or 858 counting only the distinct ones).

The product of its digits is 2100, while the sum is 27.

The square root of 153125721 is about 12374.3978035297. The cubic root of 153125721 is about 534.9945799666.

The spelling of 153125721 in words is "one hundred fifty-three million, one hundred twenty-five thousand, seven hundred twenty-one".