4921994261 has 2 divisors, whose sum is σ = 4921994262. Its totient is φ = 4921994260.

The previous prime is 4921994243. The next prime is 4921994293. The reversal of 4921994261 is 1624991294.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4887408100 + 34586161 = 69910^2 + 5881^2 .

It is a cyclic number.

It is not a de Polignac number, because 4921994261 - 2¹⁴ = 4921977877 is a prime.

It is a super-2 number, since 2×4921994261² = 48452055010633872242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4921994461) 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, 2460997130 + 2460997131.

It is an arithmetic number, because the mean of its divisors is an integer number (2460997131).

Almost surely, 2^4921994261 is an apocalyptic number.

It is an amenable number.

4921994261 is a deficient number, since it is larger than the sum of its proper divisors (1).

4921994261 is an equidigital number, since it uses as much as digits as its factorization.

4921994261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 47.

The square root of 4921994261 is about 70156.9259660085. The cubic root of 4921994261 is about 1701.0367679306.

The spelling of 4921994261 in words is "four billion, nine hundred twenty-one million, nine hundred ninety-four thousand, two hundred sixty-one".