1822851649 has 2 divisors, whose sum is σ = 1822851650. Its totient is φ = 1822851648.

The previous prime is 1822851559. The next prime is 1822851689. The reversal of 1822851649 is 9461582281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1758963600 + 63888049 = 41940^2 + 7993^2 .

It is an emirp because it is prime and its reverse (9461582281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1822851649 - 2⁹ = 1822851137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1822851599 and 1822851608.

It is not a weakly prime, because it can be changed into another prime (1822851689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 911425824 + 911425825.

It is an arithmetic number, because the mean of its divisors is an integer number (911425825).

Almost surely, 2^1822851649 is an apocalyptic number.

It is an amenable number.

1822851649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1822851649 is an equidigital number, since it uses as much as digits as its factorization.

1822851649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 276480, while the sum is 46.

The square root of 1822851649 is about 42694.8667757612. The cubic root of 1822851649 is about 1221.5664839167.

It can be divided in two parts, 1822 and 851649, that added together give a triangular number (853471 = T₁₃₀₆).

The spelling of 1822851649 in words is "one billion, eight hundred twenty-two million, eight hundred fifty-one thousand, six hundred forty-nine".