152617921 has 4 divisors (see below), whose sum is σ = 152642644. Its totient is φ = 152593200.

The previous prime is 152617919. The next prime is 152617939. The reversal of 152617921 is 129716251.

152617921 = 8735² + 8736².

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 76300225 + 76317696 = 8735^2 + 8736^2 .

It is a cyclic number.

It is not a de Polignac number, because 152617921 - 2¹ = 152617919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (152617901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5551 + ... + 18331.

It is an arithmetic number, because the mean of its divisors is an integer number (38160661).

Almost surely, 2^152617921 is an apocalyptic number.

152617921 is the 8736-th centered square number.

It is an amenable number.

152617921 is a deficient number, since it is larger than the sum of its proper divisors (24723).

152617921 is a wasteful number, since it uses less digits than its factorization.

152617921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24722.

The product of its digits is 7560, while the sum is 34.

The square root of 152617921 is about 12353.8625943468. The cubic root of 152617921 is about 534.4025368024.

The spelling of 152617921 in words is "one hundred fifty-two million, six hundred seventeen thousand, nine hundred twenty-one".