4289951621 has 2 divisors, whose sum is σ = 4289951622. Its totient is φ = 4289951620.

The previous prime is 4289951609. The next prime is 4289951623. The reversal of 4289951621 is 1261599824.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4036696225 + 253255396 = 63535^2 + 15914^2 .

It is a cyclic number.

It is not a de Polignac number, because 4289951621 - 2⁶ = 4289951557 is a prime.

Together with 4289951623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4289951623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2144975810 + 2144975811.

It is an arithmetic number, because the mean of its divisors is an integer number (2144975811).

Almost surely, 2^4289951621 is an apocalyptic number.

It is an amenable number.

4289951621 is a deficient number, since it is larger than the sum of its proper divisors (1).

4289951621 is an equidigital number, since it uses as much as digits as its factorization.

4289951621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 47.

The square root of 4289951621 is about 65497.7222581060. The cubic root of 4289951621 is about 1624.8656767551.

The spelling of 4289951621 in words is "four billion, two hundred eighty-nine million, nine hundred fifty-one thousand, six hundred twenty-one".