190245509 has 4 divisors (see below), whose sum is σ = 192653760. Its totient is φ = 187837260.

The previous prime is 190245491. The next prime is 190245511. The reversal of 190245509 is 905542091.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 905542091 = 47 ⋅19266853.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-190245509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190245529) 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, 1204007 + ... + 1204164.

It is an arithmetic number, because the mean of its divisors is an integer number (48163440).

Almost surely, 2^190245509 is an apocalyptic number.

It is an amenable number.

190245509 is a deficient number, since it is larger than the sum of its proper divisors (2408251).

190245509 is an equidigital number, since it uses as much as digits as its factorization.

190245509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2408250.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 190245509 is about 13792.9514245501. The cubic root of 190245509 is about 575.1372164018.

The spelling of 190245509 in words is "one hundred ninety million, two hundred forty-five thousand, five hundred nine".