213250915 has 4 divisors (see below), whose sum is σ = 255901104. Its totient is φ = 170600728.

The previous prime is 213250909. The next prime is 213250931. The reversal of 213250915 is 519052312.

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 213250915 - 2⁷ = 213250787 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 21325087 + ... + 21325096.

It is an arithmetic number, because the mean of its divisors is an integer number (63975276).

Almost surely, 2^213250915 is an apocalyptic number.

213250915 is a deficient number, since it is larger than the sum of its proper divisors (42650189).

213250915 is an equidigital number, since it uses as much as digits as its factorization.

213250915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42650188.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 213250915 is about 14603.1131954799. The cubic root of 213250915 is about 597.4436750650.

The spelling of 213250915 in words is "two hundred thirteen million, two hundred fifty thousand, nine hundred fifteen".