35142721 has 2 divisors, whose sum is σ = 35142722. Its totient is φ = 35142720.

The previous prime is 35142719. The next prime is 35142727. The reversal of 35142721 is 12724153.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34680321 + 462400 = 5889^2 + 680^2 .

It is a cyclic number.

It is not a de Polignac number, because 35142721 - 2¹ = 35142719 is a prime.

Together with 35142719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (35142727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17571360 + 17571361.

It is an arithmetic number, because the mean of its divisors is an integer number (17571361).

Almost surely, 2^35142721 is an apocalyptic number.

It is an amenable number.

35142721 is a deficient number, since it is larger than the sum of its proper divisors (1).

35142721 is an equidigital number, since it uses as much as digits as its factorization.

35142721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 25.

The square root of 35142721 is about 5928.1296375838. The cubic root of 35142721 is about 327.5506469464.

Adding to 35142721 its reverse (12724153), we get a palindrome (47866874).

The spelling of 35142721 in words is "thirty-five million, one hundred forty-two thousand, seven hundred twenty-one".