30911640887 has 2 divisors, whose sum is σ = 30911640888. Its totient is φ = 30911640886.

The previous prime is 30911640853. The next prime is 30911640919. The reversal of 30911640887 is 78804611903.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 30911640887 - 2⁸ = 30911640631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30911640187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15455820443 + 15455820444.

It is an arithmetic number, because the mean of its divisors is an integer number (15455820444).

Almost surely, 2^30911640887 is an apocalyptic number.

30911640887 is a deficient number, since it is larger than the sum of its proper divisors (1).

30911640887 is an equidigital number, since it uses as much as digits as its factorization.

30911640887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 47.

The spelling of 30911640887 in words is "thirty billion, nine hundred eleven million, six hundred forty thousand, eight hundred eighty-seven".