187264773081 has 9 divisors (see below), whose sum is σ = 270495436341. Its totient is φ = 124842316572.

The previous prime is 187264773067. The next prime is 187264773107. The reversal of 187264773081 is 180377462781.

The square root of 187264773081 is 432741.

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

187264773081 is a `hidden beast` number, since 1 + 8 + 7 + 264 + 77 + 308 + 1 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 187264773081 - 2⁷ = 187264772953 is a prime.

It is a super-2 number, since 2×187264773081² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (187264773001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1226100 + ... + 1370346.

Almost surely, 2^187264773081 is an apocalyptic number.

187264773081 is the 432741-st square number.

187264773081 is the 216371-st centered octagonal number.

It is an amenable number.

187264773081 is a deficient number, since it is larger than the sum of its proper divisors (83230663260).

187264773081 is an frugal number, since it uses more digits than its factorization.

187264773081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288500 (or 144250 counting only the distinct ones).

The product of its (nonzero) digits is 3161088, while the sum is 54.

The spelling of 187264773081 in words is "one hundred eighty-seven billion, two hundred sixty-four million, seven hundred seventy-three thousand, eighty-one".