215397253 has 4 divisors (see below), whose sum is σ = 215582368. Its totient is φ = 215212140.

The previous prime is 215397211. The next prime is 215397271. The reversal of 215397253 is 352793512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215397253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215397653) 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, 90801 + ... + 93142.

It is an arithmetic number, because the mean of its divisors is an integer number (53895592).

Almost surely, 2^215397253 is an apocalyptic number.

It is an amenable number.

215397253 is a deficient number, since it is larger than the sum of its proper divisors (185115).

215397253 is a wasteful number, since it uses less digits than its factorization.

215397253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185114.

The product of its digits is 56700, while the sum is 37.

The square root of 215397253 is about 14676.4182619602. The cubic root of 215397253 is about 599.4413809953.

The spelling of 215397253 in words is "two hundred fifteen million, three hundred ninety-seven thousand, two hundred fifty-three".