211154640497 has 2 divisors, whose sum is σ = 211154640498. Its totient is φ = 211154640496.

The previous prime is 211154640493. The next prime is 211154640523. The reversal of 211154640497 is 794046451112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210611237776 + 543402721 = 458924^2 + 23311^2 .

It is a cyclic number.

It is not a de Polignac number, because 211154640497 - 2² = 211154640493 is a prime.

It is not a weakly prime, because it can be changed into another prime (211154640493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105577320248 + 105577320249.

It is an arithmetic number, because the mean of its divisors is an integer number (105577320249).

Almost surely, 2^211154640497 is an apocalyptic number.

It is an amenable number.

211154640497 is a deficient number, since it is larger than the sum of its proper divisors (1).

211154640497 is an equidigital number, since it uses as much as digits as its factorization.

211154640497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 211154640497 in words is "two hundred eleven billion, one hundred fifty-four million, six hundred forty thousand, four hundred ninety-seven".