216253551 has 32 divisors (see below), whose sum is σ = 310302720. Its totient is φ = 133660800.

The previous prime is 216253537. The next prime is 216253553. The reversal of 216253551 is 155352612.

It is a happy number.

It is not a de Polignac number, because 216253551 - 2⁵ = 216253519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216253553) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 487936 + ... + 488378.

It is an arithmetic number, because the mean of its divisors is an integer number (9696960).

Almost surely, 2^216253551 is an apocalyptic number.

216253551 is a deficient number, since it is larger than the sum of its proper divisors (94049169).

216253551 is a wasteful number, since it uses less digits than its factorization.

216253551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687.

The product of its digits is 9000, while the sum is 30.

The square root of 216253551 is about 14705.5619069793. The cubic root of 216253551 is about 600.2346776432.

The spelling of 216253551 in words is "two hundred sixteen million, two hundred fifty-three thousand, five hundred fifty-one".