191891450 has 48 divisors (see below), whose sum is σ = 380987520. Its totient is φ = 71694720.

The previous prime is 191891437. The next prime is 191891467. The reversal of 191891450 is 54198191.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67967 + ... + 70733.

It is an arithmetic number, because the mean of its divisors is an integer number (7937240).

Almost surely, 2^191891450 is an apocalyptic number.

191891450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

191891450 is a deficient number, since it is larger than the sum of its proper divisors (189096070).

191891450 is a wasteful number, since it uses less digits than its factorization.

191891450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2871 (or 2866 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 38.

The square root of 191891450 is about 13852.4889460342. The cubic root of 191891450 is about 576.7910880508.

The spelling of 191891450 in words is "one hundred ninety-one million, eight hundred ninety-one thousand, four hundred fifty".