191000985541 has 8 divisors (see below), whose sum is σ = 192295560600. Its totient is φ = 189706579968.

The previous prime is 191000985523. The next prime is 191000985611. The reversal of 191000985541 is 145589000191.

It can be written as a sum of positive squares in 4 ways, for example, as 582208641 + 190418776900 = 24129^2 + 436370^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 191000985541 - 2²¹ = 190998888389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191000085541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2914365 + ... + 2979181.

It is an arithmetic number, because the mean of its divisors is an integer number (24036945075).

Almost surely, 2^191000985541 is an apocalyptic number.

It is an amenable number.

191000985541 is a deficient number, since it is larger than the sum of its proper divisors (1294575059).

191000985541 is a wasteful number, since it uses less digits than its factorization.

191000985541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84743.

The product of its (nonzero) digits is 64800, while the sum is 43.

The spelling of 191000985541 in words is "one hundred ninety-one billion, nine hundred eighty-five thousand, five hundred forty-one".