1452729221 has 2 divisors, whose sum is σ = 1452729222. Its totient is φ = 1452729220.

The previous prime is 1452729209. The next prime is 1452729259. The reversal of 1452729221 is 1229272541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1452448321 + 280900 = 38111^2 + 530^2 .

It is a cyclic number.

It is not a de Polignac number, because 1452729221 - 2³⁰ = 378987397 is a prime.

It is a super-2 number, since 2×1452729221² = 4220844379094533682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1452729821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 726364610 + 726364611.

It is an arithmetic number, because the mean of its divisors is an integer number (726364611).

Almost surely, 2^1452729221 is an apocalyptic number.

It is an amenable number.

1452729221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1452729221 is an equidigital number, since it uses as much as digits as its factorization.

1452729221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 35.

The square root of 1452729221 is about 38114.6851095480. The cubic root of 1452729221 is about 1132.5608823931.

The spelling of 1452729221 in words is "one billion, four hundred fifty-two million, seven hundred twenty-nine thousand, two hundred twenty-one".