152221561 has 4 divisors (see below), whose sum is σ = 155934324. Its totient is φ = 148508800.

The previous prime is 152221549. The next prime is 152221577. The reversal of 152221561 is 165122251.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62805625 + 89415936 = 7925^2 + 9456^2 .

It is a cyclic number.

It is not a de Polignac number, because 152221561 - 2¹⁵ = 152188793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (152222561) 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, 1856320 + ... + 1856401.

It is an arithmetic number, because the mean of its divisors is an integer number (38983581).

Almost surely, 2^152221561 is an apocalyptic number.

It is an amenable number.

152221561 is a deficient number, since it is larger than the sum of its proper divisors (3712763).

152221561 is an equidigital number, since it uses as much as digits as its factorization.

152221561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3712762.

The product of its digits is 1200, while the sum is 25.

The square root of 152221561 is about 12337.8102189975. The cubic root of 152221561 is about 533.9395081266.

The spelling of 152221561 in words is "one hundred fifty-two million, two hundred twenty-one thousand, five hundred sixty-one".