190919121 has 4 divisors (see below), whose sum is σ = 254558832. Its totient is φ = 127279412.

The previous prime is 190919119. The next prime is 190919153. The reversal of 190919121 is 121919091.

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.

It is a cyclic number.

It is not a de Polignac number, because 190919121 - 2¹ = 190919119 is a prime.

It is a super-2 number, since 2×190919121² = 72900221526825282, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (190919101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31819851 + ... + 31819856.

It is an arithmetic number, because the mean of its divisors is an integer number (63639708).

Almost surely, 2^190919121 is an apocalyptic number.

It is an amenable number.

190919121 is a deficient number, since it is larger than the sum of its proper divisors (63639711).

190919121 is an equidigital number, since it uses as much as digits as its factorization.

190919121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63639710.

The product of its (nonzero) digits is 1458, while the sum is 33.

The square root of 190919121 is about 13817.3485517302. The cubic root of 190919121 is about 575.8152227284.

The spelling of 190919121 in words is "one hundred ninety million, nine hundred nineteen thousand, one hundred twenty-one".