191381051745 has 24 divisors (see below), whose sum is σ = 357244631016. Its totient is φ = 94218363648.

The previous prime is 191381051723. The next prime is 191381051747. The reversal of 191381051745 is 547150183191.

191381051745 is a `hidden beast` number, since 1 + 9 + 13 + 81 + 0 + 517 + 45 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 8622236736 + 182758815009 = 92856^2 + 427503^2 .

It is not a de Polignac number, because 191381051745 - 2⁵ = 191381051713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 191381051745.

It is not an unprimeable number, because it can be changed into a prime (191381051747) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 163572964 + ... + 163574133.

It is an arithmetic number, because the mean of its divisors is an integer number (14885192959).

Almost surely, 2^191381051745 is an apocalyptic number.

191381051745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

191381051745 is a deficient number, since it is larger than the sum of its proper divisors (165863579271).

191381051745 is a wasteful number, since it uses less digits than its factorization.

191381051745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327147121 (or 327147118 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 45.

The spelling of 191381051745 in words is "one hundred ninety-one billion, three hundred eighty-one million, fifty-one thousand, seven hundred forty-five".