216903451 has 4 divisors (see below), whose sum is σ = 216981072. Its totient is φ = 216825832.

The previous prime is 216903443. The next prime is 216903461. The reversal of 216903451 is 154309612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216903451 - 2³ = 216903443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216903461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34456 + ... + 40261.

It is an arithmetic number, because the mean of its divisors is an integer number (54245268).

Almost surely, 2^216903451 is an apocalyptic number.

216903451 is a deficient number, since it is larger than the sum of its proper divisors (77621).

216903451 is an equidigital number, since it uses as much as digits as its factorization.

216903451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77620.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 216903451 is about 14727.6424114656. The cubic root of 216903451 is about 600.8353651058.

The spelling of 216903451 in words is "two hundred sixteen million, nine hundred three thousand, four hundred fifty-one".