215250851 has 4 divisors (see below), whose sum is σ = 215349312. Its totient is φ = 215152392.

The previous prime is 215250839. The next prime is 215250863. The reversal of 215250851 is 158052512.

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

It is an interprime number because it is at equal distance from previous prime (215250839) and next prime (215250863).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215250851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215250881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45875 + ... + 50348.

It is an arithmetic number, because the mean of its divisors is an integer number (53837328).

Almost surely, 2^215250851 is an apocalyptic number.

215250851 is a deficient number, since it is larger than the sum of its proper divisors (98461).

215250851 is an equidigital number, since it uses as much as digits as its factorization.

215250851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98460.

The product of its (nonzero) digits is 4000, while the sum is 29.

The square root of 215250851 is about 14671.4297530950. The cubic root of 215250851 is about 599.3055400376.

The spelling of 215250851 in words is "two hundred fifteen million, two hundred fifty thousand, eight hundred fifty-one".