194216557 has 2 divisors, whose sum is σ = 194216558. Its totient is φ = 194216556.

The previous prime is 194216459. The next prime is 194216563. The reversal of 194216557 is 755612491.

194216557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186213316 + 8003241 = 13646^2 + 2829^2 .

It is a cyclic number.

It is not a de Polignac number, because 194216557 - 2¹¹ = 194214509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194216257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97108278 + 97108279.

It is an arithmetic number, because the mean of its divisors is an integer number (97108279).

Almost surely, 2^194216557 is an apocalyptic number.

It is an amenable number.

194216557 is a deficient number, since it is larger than the sum of its proper divisors (1).

194216557 is an equidigital number, since it uses as much as digits as its factorization.

194216557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 40.

The square root of 194216557 is about 13936.1600521808. The cubic root of 194216557 is about 579.1113591499. Note that the first 3 decimals are identical.

The spelling of 194216557 in words is "one hundred ninety-four million, two hundred sixteen thousand, five hundred fifty-seven".