217307049 has 24 divisors (see below), whose sum is σ = 299309472. Its totient is φ = 140225280.

The previous prime is 217307029. The next prime is 217307099. The reversal of 217307049 is 940703712.

It is not a de Polignac number, because 217307049 - 2²³ = 208918441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217307029) 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, 901569 + ... + 901809.

It is an arithmetic number, because the mean of its divisors is an integer number (12471228).

Almost surely, 2^217307049 is an apocalyptic number.

It is an amenable number.

217307049 is a deficient number, since it is larger than the sum of its proper divisors (82002423).

217307049 is a wasteful number, since it uses less digits than its factorization.

217307049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 217307049 is about 14741.3381007288. The cubic root of 217307049 is about 601.2077976323.

The spelling of 217307049 in words is "two hundred seventeen million, three hundred seven thousand, forty-nine".