190999321 has 2 divisors, whose sum is σ = 190999322. Its totient is φ = 190999320.

The previous prime is 190999313. The next prime is 190999409. The reversal of 190999321 is 123999091.

190999321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154032921 + 36966400 = 12411^2 + 6080^2 .

It is an emirp because it is prime and its reverse (123999091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 190999321 - 2³ = 190999313 is a prime.

It is a super-2 number, since 2×190999321² = 72961481244922082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (190991321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95499660 + 95499661.

It is an arithmetic number, because the mean of its divisors is an integer number (95499661).

Almost surely, 2^190999321 is an apocalyptic number.

It is an amenable number.

190999321 is a deficient number, since it is larger than the sum of its proper divisors (1).

190999321 is an equidigital number, since it uses as much as digits as its factorization.

190999321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39366, while the sum is 43.

The square root of 190999321 is about 13820.2503957056. The cubic root of 190999321 is about 575.8958396161.

The spelling of 190999321 in words is "one hundred ninety million, nine hundred ninety-nine thousand, three hundred twenty-one".