220115501 has 4 divisors (see below), whose sum is σ = 221795904. Its totient is φ = 218435100.

The previous prime is 220115477. The next prime is 220115503. The reversal of 220115501 is 105511022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220115501 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 220115501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220115503) 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, 840005 + ... + 840266.

It is an arithmetic number, because the mean of its divisors is an integer number (55448976).

Almost surely, 2^220115501 is an apocalyptic number.

It is an amenable number.

220115501 is a deficient number, since it is larger than the sum of its proper divisors (1680403).

220115501 is a wasteful number, since it uses less digits than its factorization.

220115501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680402.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 220115501 is about 14836.2900012099. The cubic root of 220115501 is about 603.7867002997.

Adding to 220115501 its reverse (105511022), we get a palindrome (325626523).

The spelling of 220115501 in words is "two hundred twenty million, one hundred fifteen thousand, five hundred one".