152841721 has 4 divisors (see below), whose sum is σ = 153957492. Its totient is φ = 151725952.

The previous prime is 152841707. The next prime is 152841797. The reversal of 152841721 is 127148251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127148251 = 367 ⋅346453.

It can be written as a sum of positive squares in 2 ways, for example, as 68293696 + 84548025 = 8264^2 + 9195^2 .

It is a cyclic number.

It is not a de Polignac number, because 152841721 - 2⁷ = 152841593 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (152841701) 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, 557680 + ... + 557953.

It is an arithmetic number, because the mean of its divisors is an integer number (38489373).

Almost surely, 2^152841721 is an apocalyptic number.

It is an amenable number.

152841721 is a deficient number, since it is larger than the sum of its proper divisors (1115771).

152841721 is a wasteful number, since it uses less digits than its factorization.

152841721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115770.

The product of its digits is 4480, while the sum is 31.

The square root of 152841721 is about 12362.9171719299. The cubic root of 152841721 is about 534.6636264441.

Adding to 152841721 its reverse (127148251), we get a palindrome (279989972).

The spelling of 152841721 in words is "one hundred fifty-two million, eight hundred forty-one thousand, seven hundred twenty-one".