215005631 has 8 divisors (see below), whose sum is σ = 221055120. Its totient is φ = 208968768.

The previous prime is 215005597. The next prime is 215005723. The reversal of 215005631 is 136500512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 215005631 - 2¹⁰ = 215004607 is a prime.

It is a super-2 number, since 2×215005631² = 92454842723416322, 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 = 215005597 and 215005606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215005831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39200 + ... + 44346.

It is an arithmetic number, because the mean of its divisors is an integer number (27631890).

Almost surely, 2^215005631 is an apocalyptic number.

215005631 is a deficient number, since it is larger than the sum of its proper divisors (6049489).

215005631 is a wasteful number, since it uses less digits than its factorization.

215005631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6313.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 215005631 is about 14663.0703128642. The cubic root of 215005631 is about 599.0778714873.

The spelling of 215005631 in words is "two hundred fifteen million, five thousand, six hundred thirty-one".