216402545 has 8 divisors (see below), whose sum is σ = 260848896. Its totient is φ = 172344816.

The previous prime is 216402541. The next prime is 216402547. The reversal of 216402545 is 545204612.

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 216402545 - 2² = 216402541 is a prime.

It is a super-2 number, since 2×216402545² = 93660122964954050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216402541) 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 7 ways as a sum of consecutive naturals, for example, 95927 + ... + 98156.

It is an arithmetic number, because the mean of its divisors is an integer number (32606112).

Almost surely, 2^216402545 is an apocalyptic number.

It is an amenable number.

216402545 is a deficient number, since it is larger than the sum of its proper divisors (44446351).

216402545 is a wasteful number, since it uses less digits than its factorization.

216402545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194311.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 216402545 is about 14710.6269410926. The cubic root of 216402545 is about 600.3724955491.

The spelling of 216402545 in words is "two hundred sixteen million, four hundred two thousand, five hundred forty-five".