216474791 has 16 divisors (see below), whose sum is σ = 236658240. Its totient is φ = 196819200.

The previous prime is 216474761. The next prime is 216474833. The reversal of 216474791 is 197474612.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216474791 is a prime.

It is a super-2 number, since 2×216474791² = 93722670276987362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216474701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 359891 + ... + 360491.

It is an arithmetic number, because the mean of its divisors is an integer number (14791140).

Almost surely, 2^216474791 is an apocalyptic number.

216474791 is a deficient number, since it is larger than the sum of its proper divisors (20183449).

216474791 is a wasteful number, since it uses less digits than its factorization.

216474791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986.

The product of its digits is 84672, while the sum is 41.

The square root of 216474791 is about 14713.0823079326. The cubic root of 216474791 is about 600.4392995776.

The spelling of 216474791 in words is "two hundred sixteen million, four hundred seventy-four thousand, seven hundred ninety-one".