215240451 has 16 divisors (see below), whose sum is σ = 306716544. Its totient is φ = 133787264.

The previous prime is 215240449. The next prime is 215240551. The reversal of 215240451 is 154042512.

It is a cyclic number.

It is not a de Polignac number, because 215240451 - 2¹ = 215240449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215240411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14265 + ... + 25178.

It is an arithmetic number, because the mean of its divisors is an integer number (19169784).

Almost surely, 2^215240451 is an apocalyptic number.

215240451 is a deficient number, since it is larger than the sum of its proper divisors (91476093).

215240451 is a wasteful number, since it uses less digits than its factorization.

215240451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39570.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 215240451 is about 14671.0753184625. The cubic root of 215240451 is about 599.2958879224.

Adding to 215240451 its reverse (154042512), we get a palindrome (369282963).

The spelling of 215240451 in words is "two hundred fifteen million, two hundred forty thousand, four hundred fifty-one".