215201551 has 4 divisors (see below), whose sum is σ = 215238232. Its totient is φ = 215164872.

The previous prime is 215201549. The next prime is 215201561. The reversal of 215201551 is 155102512.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 215201551 - 2¹ = 215201549 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 (215201561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7341 + ... + 22006.

It is an arithmetic number, because the mean of its divisors is an integer number (53809558).

Almost surely, 2^215201551 is an apocalyptic number.

215201551 is a deficient number, since it is larger than the sum of its proper divisors (36681).

215201551 is an equidigital number, since it uses as much as digits as its factorization.

215201551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36680.

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 215201551 is about 14669.7495206973. The cubic root of 215201551 is about 599.2597825428.

The spelling of 215201551 in words is "two hundred fifteen million, two hundred one thousand, five hundred fifty-one".