30731217 has 12 divisors (see below), whose sum is σ = 45039120. Its totient is φ = 18624760.

The previous prime is 30731209. The next prime is 30731221. The reversal of 30731217 is 71213703.

It is not a de Polignac number, because 30731217 - 2³ = 30731209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30731117) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41967 + ... + 42692.

It is an arithmetic number, because the mean of its divisors is an integer number (3753260).

Almost surely, 2^30731217 is an apocalyptic number.

It is an amenable number.

30731217 is a deficient number, since it is larger than the sum of its proper divisors (14307903).

30731217 is a wasteful number, since it uses less digits than its factorization.

30731217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84684 (or 84673 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 24.

The square root of 30731217 is about 5543.5743884249. The cubic root of 30731217 is about 313.2275256396.

The spelling of 30731217 in words is "thirty million, seven hundred thirty-one thousand, two hundred seventeen".