149528382721 has 3 divisors (see below), whose sum is σ = 149528769411. Its totient is φ = 149527996032.

The previous prime is 149528382709. The next prime is 149528382763. The reversal of 149528382721 is 127283825941.

The square root of 149528382721 is 386689.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 127283825941 = 10771 ⋅11817271.

It can be written as a sum of positive squares in only one way, i.e., 136723197121 + 12805185600 = 369761^2 + 113160^2 .

It is not a de Polignac number, because 149528382721 - 2⁷ = 149528382593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149528382221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 193345 + ... + 580033.

It is an arithmetic number, because the mean of its divisors is an integer number (49842923137).

Almost surely, 2^149528382721 is an apocalyptic number.

149528382721 is the 386689-th square number.

149528382721 is the 193345-th centered octagonal number.

It is an amenable number.

149528382721 is a deficient number, since it is larger than the sum of its proper divisors (386690).

149528382721 is an frugal number, since it uses more digits than its factorization.

149528382721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773378 (or 386689 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 52.

The spelling of 149528382721 in words is "one hundred forty-nine billion, five hundred twenty-eight million, three hundred eighty-two thousand, seven hundred twenty-one".