2194581533 has 2 divisors, whose sum is σ = 2194581534. Its totient is φ = 2194581532.

The previous prime is 2194581511. The next prime is 2194581559. The reversal of 2194581533 is 3351854912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1921770244 + 272811289 = 43838^2 + 16517^2 .

It is a cyclic number.

It is not a de Polignac number, because 2194581533 - 2⁶ = 2194581469 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2194581563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1097290766 + 1097290767.

It is an arithmetic number, because the mean of its divisors is an integer number (1097290767).

Almost surely, 2^2194581533 is an apocalyptic number.

It is an amenable number.

2194581533 is a deficient number, since it is larger than the sum of its proper divisors (1).

2194581533 is an equidigital number, since it uses as much as digits as its factorization.

2194581533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 41.

The square root of 2194581533 is about 46846.3609365765. The cubic root of 2194581533 is about 1299.5228096720.

The spelling of 2194581533 in words is "two billion, one hundred ninety-four million, five hundred eighty-one thousand, five hundred thirty-three".