30951728639989 has 2 divisors, whose sum is σ = 30951728639990. Its totient is φ = 30951728639988.

The previous prime is 30951728639981. The next prime is 30951728640011. The reversal of 30951728639989 is 98993682715903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30888140444100 + 63588195889 = 5557710^2 + 252167^2 .

It is a cyclic number.

It is not a de Polignac number, because 30951728639989 - 2³ = 30951728639981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30951728639981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15475864319994 + 15475864319995.

It is an arithmetic number, because the mean of its divisors is an integer number (15475864319995).

Almost surely, 2^{30951728639989} is an apocalyptic number.

It is an amenable number.

30951728639989 is a deficient number, since it is larger than the sum of its proper divisors (1).

30951728639989 is an equidigital number, since it uses as much as digits as its factorization.

30951728639989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1587237120, while the sum is 79.

The spelling of 30951728639989 in words is "thirty trillion, nine hundred fifty-one billion, seven hundred twenty-eight million, six hundred thirty-nine thousand, nine hundred eighty-nine".