191781970485 has 48 divisors (see below), whose sum is σ = 363684266496. Its totient is φ = 86017556352.

The previous prime is 191781970481. The next prime is 191781970493. The reversal of 191781970485 is 584079187191.

It is not a de Polignac number, because 191781970485 - 2² = 191781970481 is a prime.

It is a super-2 number, since 2×191781970485² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191781970481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2422629 + ... + 2500538.

It is an arithmetic number, because the mean of its divisors is an integer number (7576755552).

Almost surely, 2^191781970485 is an apocalyptic number.

191781970485 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

191781970485 is a deficient number, since it is larger than the sum of its proper divisors (171902296011).

191781970485 is a wasteful number, since it uses less digits than its factorization.

191781970485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4923242 (or 4923235 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 60.

The spelling of 191781970485 in words is "one hundred ninety-one billion, seven hundred eighty-one million, nine hundred seventy thousand, four hundred eighty-five".