147451721 has 2 divisors, whose sum is σ = 147451722. Its totient is φ = 147451720.

The previous prime is 147451669. The next prime is 147451769. The reversal of 147451721 is 127154741.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76807696 + 70644025 = 8764^2 + 8405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-147451721 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (147453721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73725860 + 73725861.

It is an arithmetic number, because the mean of its divisors is an integer number (73725861).

Almost surely, 2^147451721 is an apocalyptic number.

It is an amenable number.

147451721 is a deficient number, since it is larger than the sum of its proper divisors (1).

147451721 is an equidigital number, since it uses as much as digits as its factorization.

147451721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7840, while the sum is 32.

The square root of 147451721 is about 12142.9700238451. The cubic root of 147451721 is about 528.3032494776.

The spelling of 147451721 in words is "one hundred forty-seven million, four hundred fifty-one thousand, seven hundred twenty-one".