190957609 has 2 divisors, whose sum is σ = 190957610. Its totient is φ = 190957608.

The previous prime is 190957607. The next prime is 190957643. The reversal of 190957609 is 906759091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169130025 + 21827584 = 13005^2 + 4672^2 .

It is a cyclic number.

It is not a de Polignac number, because 190957609 - 2¹ = 190957607 is a prime.

Together with 190957607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (190957603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95478804 + 95478805.

It is an arithmetic number, because the mean of its divisors is an integer number (95478805).

Almost surely, 2^190957609 is an apocalyptic number.

It is an amenable number.

190957609 is a deficient number, since it is larger than the sum of its proper divisors (1).

190957609 is an equidigital number, since it uses as much as digits as its factorization.

190957609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 153090, while the sum is 46.

The square root of 190957609 is about 13818.7412234255. The cubic root of 190957609 is about 575.8539136099.

The spelling of 190957609 in words is "one hundred ninety million, nine hundred fifty-seven thousand, six hundred nine".