190218971881 has 9 divisors (see below), whose sum is σ = 190800373501. Its totient is φ = 189639340492.

The previous prime is 190218971869. The next prime is 190218971923. The reversal of 190218971881 is 188179812091.

The square root of 190218971881 is 436141.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 190218971881 - 2¹¹ = 190218969833 is a prime.

It is a super-2 number, since 2×190218971881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190218971281) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 256014396 + ... + 256015138.

Almost surely, 2^190218971881 is an apocalyptic number.

190218971881 is the 436141-st square number.

190218971881 is the 218071-st centered octagonal number.

It is an amenable number.

190218971881 is a deficient number, since it is larger than the sum of its proper divisors (581401620).

190218971881 is an frugal number, since it uses more digits than its factorization.

190218971881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2660 (or 1330 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 55.

The spelling of 190218971881 in words is "one hundred ninety billion, two hundred eighteen million, nine hundred seventy-one thousand, eight hundred eighty-one".