147355721 has 2 divisors, whose sum is σ = 147355722. Its totient is φ = 147355720.

The previous prime is 147355717. The next prime is 147355727. The reversal of 147355721 is 127553741.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147355321 + 400 = 12139^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 147355721 - 2² = 147355717 is a prime.

It is a super-2 number, since 2×147355721² = 43427417022859682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (147355727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73677860 + 73677861.

It is an arithmetic number, because the mean of its divisors is an integer number (73677861).

Almost surely, 2^147355721 is an apocalyptic number.

It is an amenable number.

147355721 is a deficient number, since it is larger than the sum of its proper divisors (1).

147355721 is an equidigital number, since it uses as much as digits as its factorization.

147355721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29400, while the sum is 35.

The square root of 147355721 is about 12139.0164758106. The cubic root of 147355721 is about 528.1885721169.

The spelling of 147355721 in words is "one hundred forty-seven million, three hundred fifty-five thousand, seven hundred twenty-one".