212836178491 has 2 divisors, whose sum is σ = 212836178492. Its totient is φ = 212836178490.

The previous prime is 212836178407. The next prime is 212836178507. The reversal of 212836178491 is 194871638212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212836178491 is a prime.

It is a super-2 number, since 2×212836178491² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212836178591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106418089245 + 106418089246.

It is an arithmetic number, because the mean of its divisors is an integer number (106418089246).

Almost surely, 2^212836178491 is an apocalyptic number.

212836178491 is a deficient number, since it is larger than the sum of its proper divisors (1).

212836178491 is an equidigital number, since it uses as much as digits as its factorization.

212836178491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 52.

The spelling of 212836178491 in words is "two hundred twelve billion, eight hundred thirty-six million, one hundred seventy-eight thousand, four hundred ninety-one".