215225973 has 24 divisors (see below), whose sum is σ = 328865472. Its totient is φ = 135355968.

The previous prime is 215225947. The next prime is 215225987. The reversal of 215225973 is 379522512.

215225973 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-215225973 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215225993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7990 + ... + 22232.

It is an arithmetic number, because the mean of its divisors is an integer number (13702728).

Almost surely, 2^215225973 is an apocalyptic number.

215225973 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

215225973 is a deficient number, since it is larger than the sum of its proper divisors (113639499).

215225973 is a wasteful number, since it uses less digits than its factorization.

215225973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14345 (or 14342 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 215225973 is about 14670.5818903001. The cubic root of 215225973 is about 599.2824505467.

It can be divided in two parts, 21522 and 5973, that added together give a triangular number (27495 = T₂₃₄).

The spelling of 215225973 in words is "two hundred fifteen million, two hundred twenty-five thousand, nine hundred seventy-three".