142911997 has 2 divisors, whose sum is σ = 142911998. Its totient is φ = 142911996.

The previous prime is 142911991. The next prime is 142912001. The reversal of 142911997 is 799119241.

142911997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87721956 + 55190041 = 9366^2 + 7429^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142911997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142911991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71455998 + 71455999.

It is an arithmetic number, because the mean of its divisors is an integer number (71455999).

Almost surely, 2^142911997 is an apocalyptic number.

It is an amenable number.

142911997 is a deficient number, since it is larger than the sum of its proper divisors (1).

142911997 is an equidigital number, since it uses as much as digits as its factorization.

142911997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 43.

The square root of 142911997 is about 11954.5805865367. The cubic root of 142911997 is about 522.8248593720.

The spelling of 142911997 in words is "one hundred forty-two million, nine hundred eleven thousand, nine hundred ninety-seven".