31730919509 has 16 divisors (see below), whose sum is σ = 34341221376. Its totient is φ = 29204332800.

The previous prime is 31730919497. The next prime is 31730919533. The reversal of 31730919509 is 90591903713.

It is a cyclic number.

It is not a de Polignac number, because 31730919509 - 2²⁴ = 31714142293 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31730919569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 967439 + ... + 999699.

It is an arithmetic number, because the mean of its divisors is an integer number (2146326336).

Almost surely, 2^31730919509 is an apocalyptic number.

It is an amenable number.

31730919509 is a deficient number, since it is larger than the sum of its proper divisors (2610301867).

31730919509 is a wasteful number, since it uses less digits than its factorization.

31730919509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33556.

The product of its (nonzero) digits is 229635, while the sum is 47.

The spelling of 31730919509 in words is "thirty-one billion, seven hundred thirty million, nine hundred nineteen thousand, five hundred nine".