194787491 has 2 divisors, whose sum is σ = 194787492. Its totient is φ = 194787490.

The previous prime is 194787451. The next prime is 194787521.

194787491 is nontrivially palindromic in base 10.

194787491 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 is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 194787491 - 2⁶ = 194787427 is a prime.

It is not a weakly prime, because it can be changed into another prime (194787451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97393745 + 97393746.

It is an arithmetic number, because the mean of its divisors is an integer number (97393746).

Almost surely, 2^194787491 is an apocalyptic number.

194787491 is a deficient number, since it is larger than the sum of its proper divisors (1).

194787491 is an equidigital number, since it uses as much as digits as its factorization.

194787491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 50.

The square root of 194787491 is about 13956.6289267860. The cubic root of 194787491 is about 579.6782708348.

The spelling of 194787491 in words is "one hundred ninety-four million, seven hundred eighty-seven thousand, four hundred ninety-one".