4891146521 has 2 divisors, whose sum is σ = 4891146522. Its totient is φ = 4891146520.

The previous prime is 4891146503. The next prime is 4891146523. The reversal of 4891146521 is 1256411984.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3883782400 + 1007364121 = 62320^2 + 31739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4891146521 is a prime.

Together with 4891146523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4891146523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2445573260 + 2445573261.

It is an arithmetic number, because the mean of its divisors is an integer number (2445573261).

Almost surely, 2^4891146521 is an apocalyptic number.

It is an amenable number.

4891146521 is a deficient number, since it is larger than the sum of its proper divisors (1).

4891146521 is an equidigital number, since it uses as much as digits as its factorization.

4891146521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 41.

The square root of 4891146521 is about 69936.7322728193. The cubic root of 4891146521 is about 1697.4756676576.

The spelling of 4891146521 in words is "four billion, eight hundred ninety-one million, one hundred forty-six thousand, five hundred twenty-one".