142921993 has 2 divisors, whose sum is σ = 142921994. Its totient is φ = 142921992.

The previous prime is 142921991. The next prime is 142922027. The reversal of 142921993 is 399129241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142277184 + 644809 = 11928^2 + 803^2 .

It is a cyclic number.

It is not a de Polignac number, because 142921993 - 2¹ = 142921991 is a prime.

Together with 142921991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (142921991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71460996 + 71460997.

It is an arithmetic number, because the mean of its divisors is an integer number (71460997).

Almost surely, 2^142921993 is an apocalyptic number.

It is an amenable number.

142921993 is a deficient number, since it is larger than the sum of its proper divisors (1).

142921993 is an equidigital number, since it uses as much as digits as its factorization.

142921993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 40.

The square root of 142921993 is about 11954.9986616478. The cubic root of 142921993 is about 522.8370487742.

The spelling of 142921993 in words is "one hundred forty-two million, nine hundred twenty-one thousand, nine hundred ninety-three".