146188721 has 4 divisors (see below), whose sum is σ = 167072832. Its totient is φ = 125304612.

The previous prime is 146188711. The next prime is 146188733. The reversal of 146188721 is 127881641.

It is a happy number.

146188721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 127881641 = 4987 ⋅25643.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-146188721 is a prime.

It is a super-2 number, since 2×146188721² = 42742284295231682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (146188711) 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, 10442045 + ... + 10442058.

It is an arithmetic number, because the mean of its divisors is an integer number (41768208).

Almost surely, 2^146188721 is an apocalyptic number.

It is an amenable number.

146188721 is a deficient number, since it is larger than the sum of its proper divisors (20884111).

146188721 is an equidigital number, since it uses as much as digits as its factorization.

146188721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20884110.

The product of its digits is 21504, while the sum is 38.

The square root of 146188721 is about 12090.8527821655. The cubic root of 146188721 is about 526.7905255791.

The spelling of 146188721 in words is "one hundred forty-six million, one hundred eighty-eight thousand, seven hundred twenty-one".