3142721 has 2 divisors, whose sum is σ = 3142722. Its totient is φ = 3142720.

The previous prime is 3142717. The next prime is 3142729. The reversal of 3142721 is 1272413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3010225 + 132496 = 1735^2 + 364^2 .

It is a cyclic number.

It is not a de Polignac number, because 3142721 - 2² = 3142717 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 3142693 and 3142702.

It is not a weakly prime, because it can be changed into another prime (3142729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1571360 + 1571361.

It is an arithmetic number, because the mean of its divisors is an integer number (1571361).

Almost surely, 2^3142721 is an apocalyptic number.

It is an amenable number.

3142721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3142721 is an equidigital number, since it uses as much as digits as its factorization.

3142721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 20.

The square root of 3142721 is about 1772.7721229758. The cubic root of 3142721 is about 146.4767209378.

The spelling of 3142721 in words is "three million, one hundred forty-two thousand, seven hundred twenty-one".