146839681 has 4 divisors (see below), whose sum is σ = 146910532. Its totient is φ = 146768832.

The previous prime is 146839661. The next prime is 146839687. The reversal of 146839681 is 186938641.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27920656 + 118919025 = 5284^2 + 10905^2 .

It is a cyclic number.

It is not a de Polignac number, because 146839681 - 2²¹ = 144742529 is a prime.

It is a super-2 number, since 2×146839681² = 43123783832363522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (146839687) 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, 32220 + ... + 36493.

It is an arithmetic number, because the mean of its divisors is an integer number (36727633).

Almost surely, 2^146839681 is an apocalyptic number.

It is an amenable number.

146839681 is a deficient number, since it is larger than the sum of its proper divisors (70851).

146839681 is an equidigital number, since it uses as much as digits as its factorization.

146839681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70850.

The product of its digits is 248832, while the sum is 46.

The square root of 146839681 is about 12117.7424052502. The cubic root of 146839681 is about 527.5712785242.

The spelling of 146839681 in words is "one hundred forty-six million, eight hundred thirty-nine thousand, six hundred eighty-one".