146788721 has 2 divisors, whose sum is σ = 146788722. Its totient is φ = 146788720.

The previous prime is 146788717. The next prime is 146788723. The reversal of 146788721 is 127887641.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107350321 + 39438400 = 10361^2 + 6280^2 .

It is a cyclic number.

It is not a de Polignac number, because 146788721 - 2² = 146788717 is a prime.

It is a super-2 number, since 2×146788721² = 43093857225631682, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 146788723, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (146788723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73394360 + 73394361.

It is an arithmetic number, because the mean of its divisors is an integer number (73394361).

Almost surely, 2^146788721 is an apocalyptic number.

It is an amenable number.

146788721 is a deficient number, since it is larger than the sum of its proper divisors (1).

146788721 is an equidigital number, since it uses as much as digits as its factorization.

146788721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 44.

The square root of 146788721 is about 12115.6395208837. The cubic root of 146788721 is about 527.5102411105.

The spelling of 146788721 in words is "one hundred forty-six million, seven hundred eighty-eight thousand, seven hundred twenty-one".