146831721 has 8 divisors (see below), whose sum is σ = 195833280. Its totient is φ = 97858992.

The previous prime is 146831681. The next prime is 146831759. The reversal of 146831721 is 127138641.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-146831721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (146831761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11971 + ... + 20903.

It is an arithmetic number, because the mean of its divisors is an integer number (24479160).

Almost surely, 2^146831721 is an apocalyptic number.

It is an amenable number.

146831721 is a deficient number, since it is larger than the sum of its proper divisors (49001559).

146831721 is an equidigital number, since it uses as much as digits as its factorization.

146831721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14415.

The product of its digits is 8064, while the sum is 33.

The square root of 146831721 is about 12117.4139567814. The cubic root of 146831721 is about 527.5617453534.

The spelling of 146831721 in words is "one hundred forty-six million, eight hundred thirty-one thousand, seven hundred twenty-one".