29987339208989 has 2 divisors, whose sum is σ = 29987339208990. Its totient is φ = 29987339208988.

The previous prime is 29987339208961. The next prime is 29987339209033. The reversal of 29987339208989 is 98980293378992.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19545974892889 + 10441364316100 = 4421083^2 + 3231310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29987339208989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 29987339208989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29987339208889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14993669604494 + 14993669604495.

It is an arithmetic number, because the mean of its divisors is an integer number (14993669604495).

Almost surely, 2^{29987339208989} is an apocalyptic number.

It is an amenable number.

29987339208989 is a deficient number, since it is larger than the sum of its proper divisors (1).

29987339208989 is an equidigital number, since it uses as much as digits as its factorization.

29987339208989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7618738176, while the sum is 86.

The spelling of 29987339208989 in words is "twenty-nine trillion, nine hundred eighty-seven billion, three hundred thirty-nine million, two hundred eight thousand, nine hundred eighty-nine".