2153215531 has 8 divisors (see below), whose sum is σ = 2171303424. Its totient is φ = 2135145600.

The previous prime is 2153215513. The next prime is 2153215549. The reversal of 2153215531 is 1355123512.

It is an interprime number because it is at equal distance from previous prime (2153215513) and next prime (2153215549).

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 2153215531 - 2¹³ = 2153207339 is a prime.

It is a super-2 number, since 2×2153215531² = 9272674245879223922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2153215531.

It is not an unprimeable number, because it can be changed into a prime (2153215591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352701 + ... + 358753.

It is an arithmetic number, because the mean of its divisors is an integer number (271412928).

Almost surely, 2^2153215531 is an apocalyptic number.

2153215531 is a deficient number, since it is larger than the sum of its proper divisors (18087893).

2153215531 is a wasteful number, since it uses less digits than its factorization.

2153215531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8981.

The product of its digits is 4500, while the sum is 28.

The square root of 2153215531 is about 46402.7534851112. The cubic root of 2153215531 is about 1291.3059968338.

The spelling of 2153215531 in words is "two billion, one hundred fifty-three million, two hundred fifteen thousand, five hundred thirty-one".