115151221 has 4 divisors (see below), whose sum is σ = 115188844. Its totient is φ = 115113600.

The previous prime is 115151213. The next prime is 115151233. The reversal of 115151221 is 122151511.

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 105472900 + 9678321 = 10270^2 + 3111^2 .

It is a cyclic number.

It is not a de Polignac number, because 115151221 - 2³ = 115151213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115151261) 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, 13770 + ... + 20491.

It is an arithmetic number, because the mean of its divisors is an integer number (28797211).

Almost surely, 2^115151221 is an apocalyptic number.

It is an amenable number.

115151221 is a deficient number, since it is larger than the sum of its proper divisors (37623).

115151221 is an equidigital number, since it uses as much as digits as its factorization.

115151221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37622.

The product of its digits is 100, while the sum is 19.

The square root of 115151221 is about 10730.8536939053. The cubic root of 115151221 is about 486.5074731607.

The spelling of 115151221 in words is "one hundred fifteen million, one hundred fifty-one thousand, two hundred twenty-one".