30811148761 has 2 divisors, whose sum is σ = 30811148762. Its totient is φ = 30811148760.

The previous prime is 30811148759. The next prime is 30811148783. The reversal of 30811148761 is 16784111803.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24879068361 + 5932080400 = 157731^2 + 77020^2 .

It is a cyclic number.

It is not a de Polignac number, because 30811148761 - 2¹ = 30811148759 is a prime.

Together with 30811148759, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (30811146761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15405574380 + 15405574381.

It is an arithmetic number, because the mean of its divisors is an integer number (15405574381).

Almost surely, 2^30811148761 is an apocalyptic number.

It is an amenable number.

30811148761 is a deficient number, since it is larger than the sum of its proper divisors (1).

30811148761 is an equidigital number, since it uses as much as digits as its factorization.

30811148761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 40.

The spelling of 30811148761 in words is "thirty billion, eight hundred eleven million, one hundred forty-eight thousand, seven hundred sixty-one".