217801045 has 32 divisors (see below), whose sum is σ = 327168000. Its totient is φ = 135224640.

The previous prime is 217801027. The next prime is 217801057. The reversal of 217801045 is 540108712.

It is not a de Polignac number, because 217801045 - 2⁵ = 217801013 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 107956 + ... + 109954.

It is an arithmetic number, because the mean of its divisors is an integer number (10224000).

Almost surely, 2^217801045 is an apocalyptic number.

It is an amenable number.

217801045 is a deficient number, since it is larger than the sum of its proper divisors (109366955).

217801045 is a wasteful number, since it uses less digits than its factorization.

217801045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2305.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 217801045 is about 14758.0840558658. The cubic root of 217801045 is about 601.6630206048.

Adding to 217801045 its reverse (540108712), we get a palindrome (757909757).

The spelling of 217801045 in words is "two hundred seventeen million, eight hundred one thousand, forty-five".