216431701 has 8 divisors (see below), whose sum is σ = 220749624. Its totient is φ = 212122560.

The previous prime is 216431693. The next prime is 216431729. The reversal of 216431701 is 107134612.

It can be written as a sum of positive squares in 4 ways, for example, as 20711601 + 195720100 = 4551^2 + 13990^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216431701 - 2³ = 216431693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216431731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71715 + ... + 74671.

It is an arithmetic number, because the mean of its divisors is an integer number (27593703).

Almost surely, 2^216431701 is an apocalyptic number.

It is an amenable number.

216431701 is a deficient number, since it is larger than the sum of its proper divisors (4317923).

216431701 is a wasteful number, since it uses less digits than its factorization.

216431701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4391.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 216431701 is about 14711.6178919927. The cubic root of 216431701 is about 600.3994571458.

The spelling of 216431701 in words is "two hundred sixteen million, four hundred thirty-one thousand, seven hundred one".