215134531 has 4 divisors (see below), whose sum is σ = 215218872. Its totient is φ = 215050192.

The previous prime is 215134529. The next prime is 215134537. The reversal of 215134531 is 135431512.

It is a happy number.

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 215134531 - 2¹ = 215134529 is a prime.

It is a super-2 number, since 2×215134531² = 92565732857179922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215134496 and 215134505.

It is not an unprimeable number, because it can be changed into a prime (215134537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38221 + ... + 43486.

It is an arithmetic number, because the mean of its divisors is an integer number (53804718).

Almost surely, 2^215134531 is an apocalyptic number.

215134531 is a deficient number, since it is larger than the sum of its proper divisors (84341).

215134531 is an equidigital number, since it uses as much as digits as its factorization.

215134531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84340.

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

The square root of 215134531 is about 14667.4650502396. The cubic root of 215134531 is about 599.1975671290.

The spelling of 215134531 in words is "two hundred fifteen million, one hundred thirty-four thousand, five hundred thirty-one".