191484132921 has 63 divisors (see below), whose sum is σ = 303356032479. Its totient is φ = 120795568272.

The previous prime is 191484132919. The next prime is 191484132923. The reversal of 191484132921 is 129231484191.

The square root of 191484132921 is 437589.

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

191484132921 is a `hidden beast` number, since 1 + 9 + 148 + 413 + 2 + 92 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (191484132919) and next prime (191484132923).

It can be written as a sum of positive squares in only one way, i.e., 11059677225 + 180424455696 = 105165^2 + 424764^2 .

It is not a de Polignac number, because 191484132921 - 2¹ = 191484132919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (191484132923) 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 62 ways as a sum of consecutive naturals, for example, 224482731 + ... + 224483583.

Almost surely, 2^191484132921 is an apocalyptic number.

191484132921 is the 437589-th square number.

191484132921 is the 218795-th centered octagonal number.

It is an amenable number.

191484132921 is a deficient number, since it is larger than the sum of its proper divisors (111871899558).

191484132921 is an frugal number, since it uses more digits than its factorization.

191484132921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1762 (or 875 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The spelling of 191484132921 in words is "one hundred ninety-one billion, four hundred eighty-four million, one hundred thirty-two thousand, nine hundred twenty-one".