142664993 has 2 divisors, whose sum is σ = 142664994. Its totient is φ = 142664992.

The previous prime is 142664987. The next prime is 142665001. The reversal of 142664993 is 399466241.

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., 141300769 + 1364224 = 11887^2 + 1168^2 .

It is a cyclic number.

It is not a de Polignac number, because 142664993 - 2⁸ = 142664737 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (142664983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71332496 + 71332497.

It is an arithmetic number, because the mean of its divisors is an integer number (71332497).

Almost surely, 2^142664993 is an apocalyptic number.

It is an amenable number.

142664993 is a deficient number, since it is larger than the sum of its proper divisors (1).

142664993 is an equidigital number, since it uses as much as digits as its factorization.

142664993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 44.

The square root of 142664993 is about 11944.2451833509. The cubic root of 142664993 is about 522.5234750562.

The spelling of 142664993 in words is "one hundred forty-two million, six hundred sixty-four thousand, nine hundred ninety-three".