190505257 has 4 divisors (see below), whose sum is σ = 193628356. Its totient is φ = 187382160.

The previous prime is 190505221. The next prime is 190505279. The reversal of 190505257 is 752505091.

190505257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75672601 + 114832656 = 8699^2 + 10716^2 .

It is a cyclic number.

It is not a de Polignac number, because 190505257 - 2¹⁵ = 190472489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190505057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1561458 + ... + 1561579.

It is an arithmetic number, because the mean of its divisors is an integer number (48407089).

Almost surely, 2^190505257 is an apocalyptic number.

It is an amenable number.

190505257 is a deficient number, since it is larger than the sum of its proper divisors (3123099).

190505257 is an equidigital number, since it uses as much as digits as its factorization.

190505257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3123098.

The product of its (nonzero) digits is 15750, while the sum is 34.

The square root of 190505257 is about 13802.3641815451. The cubic root of 190505257 is about 575.3988481651.

The spelling of 190505257 in words is "one hundred ninety million, five hundred five thousand, two hundred fifty-seven".