191320450 has 12 divisors (see below), whose sum is σ = 355856130. Its totient is φ = 76528160.

The previous prime is 191320447. The next prime is 191320457. The reversal of 191320450 is 54023191.

It can be written as a sum of positive squares in 3 ways, for example, as 128799801 + 62520649 = 11349^2 + 7907^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a zygodrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (191320457) 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 5 ways as a sum of consecutive naturals, for example, 1913155 + ... + 1913254.

Almost surely, 2^191320450 is an apocalyptic number.

191320450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

191320450 is a deficient number, since it is larger than the sum of its proper divisors (164535680).

191320450 is a wasteful number, since it uses less digits than its factorization.

191320450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3826421 (or 3826416 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 191320450 is about 13831.8635765395. The cubic root of 191320450 is about 576.2184119782.

The spelling of 191320450 in words is "one hundred ninety-one million, three hundred twenty thousand, four hundred fifty".