146610721 has 4 divisors (see below), whose sum is σ = 146778772. Its totient is φ = 146442672.

The previous prime is 146610701. The next prime is 146610757. The reversal of 146610721 is 127016641.

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 58982400 + 87628321 = 7680^2 + 9361^2 .

It is a cyclic number.

It is not a de Polignac number, because 146610721 - 2¹⁵ = 146577953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 146610721.

It is not an unprimeable number, because it can be changed into a prime (146610701) 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, 82710 + ... + 84463.

It is an arithmetic number, because the mean of its divisors is an integer number (36694693).

Almost surely, 2^146610721 is an apocalyptic number.

It is an amenable number.

146610721 is a deficient number, since it is larger than the sum of its proper divisors (168051).

146610721 is an equidigital number, since it uses as much as digits as its factorization.

146610721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168050.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 146610721 is about 12108.2914153897. The cubic root of 146610721 is about 527.2969304378.

The spelling of 146610721 in words is "one hundred forty-six million, six hundred ten thousand, seven hundred twenty-one".