211131198747551 has 2 divisors, whose sum is σ = 211131198747552. Its totient is φ = 211131198747550.

The previous prime is 211131198747509. The next prime is 211131198747559. The reversal of 211131198747551 is 155747891131112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211131198747551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211131198747559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105565599373775 + 105565599373776.

It is an arithmetic number, because the mean of its divisors is an integer number (105565599373776).

Almost surely, 2^{211131198747551} is an apocalyptic number.

211131198747551 is a deficient number, since it is larger than the sum of its proper divisors (1).

211131198747551 is an equidigital number, since it uses as much as digits as its factorization.

211131198747551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2116800, while the sum is 56.

The spelling of 211131198747551 in words is "two hundred eleven trillion, one hundred thirty-one billion, one hundred ninety-eight million, seven hundred forty-seven thousand, five hundred fifty-one".