215225154 has 48 divisors (see below), whose sum is σ = 490434720. Its totient is φ = 69962400.

The previous prime is 215225147. The next prime is 215225161. The reversal of 215225154 is 451522512.

It is an interprime number because it is at equal distance from previous prime (215225147) and next prime (215225161).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 89589 + ... + 91959.

It is an arithmetic number, because the mean of its divisors is an integer number (10217390).

Almost surely, 2^215225154 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215225154, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245217360).

215225154 is an abundant number, since it is smaller than the sum of its proper divisors (275209566).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215225154 is a wasteful number, since it uses less digits than its factorization.

215225154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2464 (or 2417 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 215225154 is about 14670.5539772703. The cubic root of 215225154 is about 599.2816903954.

Adding to 215225154 its reverse (451522512), we get a palindrome (666747666).

The spelling of 215225154 in words is "two hundred fifteen million, two hundred twenty-five thousand, one hundred fifty-four".