191909005545 has 16 divisors (see below), whose sum is σ = 307763551872. Its totient is φ = 102115088640.

The previous prime is 191909005537. The next prime is 191909005553. The reversal of 191909005545 is 545500909191.

191909005545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (191909005537) and next prime (191909005553).

It is not a de Polignac number, because 191909005545 - 2³ = 191909005537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 191909005494 and 191909005503.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14767101 + ... + 14780090.

It is an arithmetic number, because the mean of its divisors is an integer number (19235221992).

Almost surely, 2^191909005545 is an apocalyptic number.

191909005545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

191909005545 is a deficient number, since it is larger than the sum of its proper divisors (115854546327).

191909005545 is a wasteful number, since it uses less digits than its factorization.

191909005545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29547632.

The product of its (nonzero) digits is 364500, while the sum is 48.

The spelling of 191909005545 in words is "one hundred ninety-one billion, nine hundred nine million, five thousand, five hundred forty-five".