146528681 has 4 divisors (see below), whose sum is σ = 157800132. Its totient is φ = 135257232.

The previous prime is 146528671. The next prime is 146528693. The reversal of 146528681 is 186825641.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186825641 = 173 ⋅1079917.

It can be written as a sum of positive squares in 2 ways, for example, as 16933225 + 129595456 = 4115^2 + 11384^2 .

It is a cyclic number.

It is not a de Polignac number, because 146528681 - 2¹⁸ = 146266537 is a prime.

It is a super-2 number, since 2×146528681² = 42941308711199522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (146528671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5635706 + ... + 5635731.

It is an arithmetic number, because the mean of its divisors is an integer number (39450033).

Almost surely, 2^146528681 is an apocalyptic number.

It is an amenable number.

146528681 is a deficient number, since it is larger than the sum of its proper divisors (11271451).

146528681 is a wasteful number, since it uses less digits than its factorization.

146528681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11271450.

The product of its digits is 92160, while the sum is 41.

The square root of 146528681 is about 12104.9031801167. The cubic root of 146528681 is about 527.1985576599.

The spelling of 146528681 in words is "one hundred forty-six million, five hundred twenty-eight thousand, six hundred eighty-one".