4951289921 has 2 divisors, whose sum is σ = 4951289922. Its totient is φ = 4951289920.

The previous prime is 4951289869. The next prime is 4951289923. The reversal of 4951289921 is 1299821594.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3799366321 + 1151923600 = 61639^2 + 33940^2 .

It is a cyclic number.

It is not a de Polignac number, because 4951289921 - 2²² = 4947095617 is a prime.

Together with 4951289923, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4951289921.

It is not a weakly prime, because it can be changed into another prime (4951289923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2475644960 + 2475644961.

It is an arithmetic number, because the mean of its divisors is an integer number (2475644961).

Almost surely, 2^4951289921 is an apocalyptic number.

It is an amenable number.

4951289921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4951289921 is an equidigital number, since it uses as much as digits as its factorization.

4951289921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 50.

The square root of 4951289921 is about 70365.4028695921. The cubic root of 4951289921 is about 1704.4049454959.

The spelling of 4951289921 in words is "four billion, nine hundred fifty-one million, two hundred eighty-nine thousand, nine hundred twenty-one".