216511054 has 4 divisors (see below), whose sum is σ = 324766584. Its totient is φ = 108255526.

The previous prime is 216511039. The next prime is 216511069. The reversal of 216511054 is 450115612.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (216511039) and next prime (216511069).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54127762 + ... + 54127765.

It is an arithmetic number, because the mean of its divisors is an integer number (81191646).

Almost surely, 2^216511054 is an apocalyptic number.

216511054 is a deficient number, since it is larger than the sum of its proper divisors (108255530).

216511054 is a wasteful number, since it uses less digits than its factorization.

216511054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108255529.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 216511054 is about 14714.3145949786. The cubic root of 216511054 is about 600.4728254438.

Adding to 216511054 its reverse (450115612), we get a palindrome (666626666).

The spelling of 216511054 in words is "two hundred sixteen million, five hundred eleven thousand, fifty-four".