2897783821 has 2 divisors, whose sum is σ = 2897783822. Its totient is φ = 2897783820.

The previous prime is 2897783789. The next prime is 2897783827. The reversal of 2897783821 is 1283877982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2897668900 + 114921 = 53830^2 + 339^2 .

It is a cyclic number.

It is not a de Polignac number, because 2897783821 - 2⁵ = 2897783789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2897783827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1448891910 + 1448891911.

It is an arithmetic number, because the mean of its divisors is an integer number (1448891911).

Almost surely, 2^2897783821 is an apocalyptic number.

It is an amenable number.

2897783821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2897783821 is an equidigital number, since it uses as much as digits as its factorization.

2897783821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2709504, while the sum is 55.

The square root of 2897783821 is about 53831.0674332211. The cubic root of 2897783821 is about 1425.6797940081.

The spelling of 2897783821 in words is "two billion, eight hundred ninety-seven million, seven hundred eighty-three thousand, eight hundred twenty-one".