215133451 has 12 divisors (see below), whose sum is σ = 235152072. Its totient is φ = 196712256.

The previous prime is 215133403. The next prime is 215133463. The reversal of 215133451 is 154331512.

It is a happy number.

215133451 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 215133451 - 2¹¹ = 215131403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215133481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12135 + ... + 24031.

It is an arithmetic number, because the mean of its divisors is an integer number (19596006).

Almost surely, 2^215133451 is an apocalyptic number.

215133451 is a deficient number, since it is larger than the sum of its proper divisors (20018621).

215133451 is a wasteful number, since it uses less digits than its factorization.

215133451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12030 (or 12017 counting only the distinct ones).

The product of its digits is 1800, while the sum is 25.

The square root of 215133451 is about 14667.4282340157. The cubic root of 215133451 is about 599.1965644472.

Adding to 215133451 its reverse (154331512), we get a palindrome (369464963).

It can be divided in two parts, 21513 and 3451, that added together give a square (24964 = 158²).

The spelling of 215133451 in words is "two hundred fifteen million, one hundred thirty-three thousand, four hundred fifty-one".