30989156857987 has 2 divisors, whose sum is σ = 30989156857988. Its totient is φ = 30989156857986.

The previous prime is 30989156857979. The next prime is 30989156858041. The reversal of 30989156857987 is 78975865198903.

It is a weak prime.

It is an emirp because it is prime and its reverse (78975865198903) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30989156857987 - 2³ = 30989156857979 is a prime.

It is not a weakly prime, because it can be changed into another prime (30989156857937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15494578428993 + 15494578428994.

It is an arithmetic number, because the mean of its divisors is an integer number (15494578428994).

Almost surely, 2^{30989156857987} is an apocalyptic number.

30989156857987 is a deficient number, since it is larger than the sum of its proper divisors (1).

30989156857987 is an equidigital number, since it uses as much as digits as its factorization.

30989156857987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8230118400, while the sum is 85.

The spelling of 30989156857987 in words is "thirty trillion, nine hundred eighty-nine billion, one hundred fifty-six million, eight hundred fifty-seven thousand, nine hundred eighty-seven".