216113531 has 8 divisors (see below), whose sum is σ = 218544480. Its totient is φ = 213696448.

The previous prime is 216113509. The next prime is 216113549. The reversal of 216113531 is 135311612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216113531 is a prime.

It is a super-2 number, since 2×216113531² = 93410116562575922, 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 = 216113497 and 216113506.

It is not an unprimeable number, because it can be changed into a prime (216113561) 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, 29615 + ... + 36183.

It is an arithmetic number, because the mean of its divisors is an integer number (27318060).

Almost surely, 2^216113531 is an apocalyptic number.

216113531 is a deficient number, since it is larger than the sum of its proper divisors (2430949).

216113531 is a wasteful number, since it uses less digits than its factorization.

216113531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6933.

The product of its digits is 540, while the sum is 23.

The square root of 216113531 is about 14700.8003523618. The cubic root of 216113531 is about 600.1051028842.

The spelling of 216113531 in words is "two hundred sixteen million, one hundred thirteen thousand, five hundred thirty-one".