30985988389 has 4 divisors (see below), whose sum is σ = 30988469356. Its totient is φ = 30983507424.

The previous prime is 30985988387. The next prime is 30985988399. The reversal of 30985988389 is 98388958903.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23448796900 + 7537191489 = 153130^2 + 86817^2 .

It is a cyclic number.

It is not a de Polignac number, because 30985988389 - 2¹ = 30985988387 is a prime.

It is a super-4 number, since 4×30985988389⁴ (a number of 43 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30985988381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1221654 + ... + 1246759.

It is an arithmetic number, because the mean of its divisors is an integer number (7747117339).

Almost surely, 2^30985988389 is an apocalyptic number.

It is an amenable number.

30985988389 is a deficient number, since it is larger than the sum of its proper divisors (2480967).

30985988389 is a wasteful number, since it uses less digits than its factorization.

30985988389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2480966.

The product of its (nonzero) digits is 134369280, while the sum is 70.

The spelling of 30985988389 in words is "thirty billion, nine hundred eighty-five million, nine hundred eighty-eight thousand, three hundred eighty-nine".