215201451 has 16 divisors (see below), whose sum is σ = 291200000. Its totient is φ = 141343488.

The previous prime is 215201443. The next prime is 215201513. The reversal of 215201451 is 154102512.

It is not a de Polignac number, because 215201451 - 2³ = 215201443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215201401) 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 15 ways as a sum of consecutive naturals, for example, 171675 + ... + 172923.

It is an arithmetic number, because the mean of its divisors is an integer number (18200000).

Almost surely, 2^215201451 is an apocalyptic number.

215201451 is a deficient number, since it is larger than the sum of its proper divisors (75998549).

215201451 is a wasteful number, since it uses less digits than its factorization.

215201451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2058.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 215201451 is about 14669.7461123225. The cubic root of 215201451 is about 599.2596897213.

Adding to 215201451 its reverse (154102512), we get a palindrome (369303963).

The spelling of 215201451 in words is "two hundred fifteen million, two hundred one thousand, four hundred fifty-one".