191354628481 has 27 divisors (see below), whose sum is σ = 201132836163. Its totient is φ = 182045446560.

The previous prime is 191354628467. The next prime is 191354628499. The reversal of 191354628481 is 184826453191.

The square root of 191354628481 is 437441.

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

It can be written as a sum of positive squares in only one way, i.e., 112402620225 + 78952008256 = 335265^2 + 280984^2 .

It is not a de Polignac number, because 191354628481 - 2⁹ = 191354627969 is a prime.

It is a super-2 number, since 2×191354628481² (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 (191354628461) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1396749045 + ... + 1396749181.

Almost surely, 2^191354628481 is an apocalyptic number.

191354628481 is the 437441-st square number.

191354628481 is the 218721-st centered octagonal number.

It is an amenable number.

191354628481 is a deficient number, since it is larger than the sum of its proper divisors (9778207682).

191354628481 is an frugal number, since it uses more digits than its factorization.

191354628481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542 (or 271 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 52.

The spelling of 191354628481 in words is "one hundred ninety-one billion, three hundred fifty-four million, six hundred twenty-eight thousand, four hundred eighty-one".