2194521913 has 2 divisors, whose sum is σ = 2194521914. Its totient is φ = 2194521912.

The previous prime is 2194521887. The next prime is 2194521919. The reversal of 2194521913 is 3191254912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2029322304 + 165199609 = 45048^2 + 12853^2 .

It is a cyclic number.

It is not a de Polignac number, because 2194521913 - 2²¹ = 2192424761 is a prime.

It is not a weakly prime, because it can be changed into another prime (2194521919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1097260956 + 1097260957.

It is an arithmetic number, because the mean of its divisors is an integer number (1097260957).

Almost surely, 2^2194521913 is an apocalyptic number.

It is an amenable number.

2194521913 is a deficient number, since it is larger than the sum of its proper divisors (1).

2194521913 is an equidigital number, since it uses as much as digits as its factorization.

2194521913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 37.

The square root of 2194521913 is about 46845.7245968082. The cubic root of 2194521913 is about 1299.5110415589.

The spelling of 2194521913 in words is "two billion, one hundred ninety-four million, five hundred twenty-one thousand, nine hundred thirteen".