246661991 has 2 divisors, whose sum is σ = 246661992. Its totient is φ = 246661990.

The previous prime is 246661939. The next prime is 246661997. The reversal of 246661991 is 199166642.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-246661991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (246661997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123330995 + 123330996.

It is an arithmetic number, because the mean of its divisors is an integer number (123330996).

Almost surely, 2^246661991 is an apocalyptic number.

246661991 is a deficient number, since it is larger than the sum of its proper divisors (1).

246661991 is an equidigital number, since it uses as much as digits as its factorization.

246661991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 44.

The square root of 246661991 is about 15705.4764652334. The cubic root of 246661991 is about 627.1442010838.

The spelling of 246661991 in words is "two hundred forty-six million, six hundred sixty-one thousand, nine hundred ninety-one".