216801975 has 24 divisors (see below), whose sum is σ = 386020432. Its totient is φ = 106732800.

The previous prime is 216801971. The next prime is 216801983. The reversal of 216801975 is 579108612.

It is not a de Polignac number, because 216801975 - 2² = 216801971 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216801971) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 110206 + ... + 112155.

Almost surely, 2^216801975 is an apocalyptic number.

216801975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

216801975 is a deficient number, since it is larger than the sum of its proper divisors (169218457).

216801975 is a wasteful number, since it uses less digits than its factorization.

216801975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222387 (or 222382 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 216801975 is about 14724.1969220735. The cubic root of 216801975 is about 600.7416523198.

The spelling of 216801975 in words is "two hundred sixteen million, eight hundred one thousand, nine hundred seventy-five".