146642681 has 4 divisors (see below), whose sum is σ = 147288912. Its totient is φ = 145996452.

The previous prime is 146642677. The next prime is 146642693. The reversal of 146642681 is 186246641.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 146642681 - 2² = 146642677 is a prime.

It is a super-2 number, since 2×146642681² = 43008151781735522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (146642611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322775 + ... + 323228.

It is an arithmetic number, because the mean of its divisors is an integer number (36822228).

Almost surely, 2^146642681 is an apocalyptic number.

It is an amenable number.

146642681 is a deficient number, since it is larger than the sum of its proper divisors (646231).

146642681 is an equidigital number, since it uses as much as digits as its factorization.

146642681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646230.

The product of its digits is 55296, while the sum is 38.

The square root of 146642681 is about 12109.6111002790. The cubic root of 146642681 is about 527.3352432010.

The spelling of 146642681 in words is "one hundred forty-six million, six hundred forty-two thousand, six hundred eighty-one".