215251000 has 64 divisors (see below), whose sum is σ = 530244000. Its totient is φ = 81561600.

The previous prime is 215250989. The next prime is 215251007. The reversal of 215251000 is 152512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215251007) 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, 13336 + ... + 24664.

Almost surely, 2^215251000 is an apocalyptic number.

215251000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215251000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265122000).

215251000 is an abundant number, since it is smaller than the sum of its proper divisors (314993000).

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

215251000 is a wasteful number, since it uses less digits than its factorization.

215251000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11369 (or 11355 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 215251000 is about 14671.4348309905. The cubic root of 215251000 is about 599.3056783204.

The spelling of 215251000 in words is "two hundred fifteen million, two hundred fifty-one thousand".