142978331 has 2 divisors, whose sum is σ = 142978332. Its totient is φ = 142978330.

The previous prime is 142978321. The next prime is 142978337. The reversal of 142978331 is 133879241.

It is a strong prime.

It is an emirp because it is prime and its reverse (133879241) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142978331 is a prime.

It is a super-2 number, since 2×142978331² = 40885606271091122, which contains 22 as substring.

It is a Chen prime.

It is equal to p_8070896 and since 142978331 and 8070896 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (142978337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71489165 + 71489166.

It is an arithmetic number, because the mean of its divisors is an integer number (71489166).

Almost surely, 2^142978331 is an apocalyptic number.

142978331 is a deficient number, since it is larger than the sum of its proper divisors (1).

142978331 is an equidigital number, since it uses as much as digits as its factorization.

142978331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 38.

The square root of 142978331 is about 11957.3546823702. The cubic root of 142978331 is about 522.9057382823.

The spelling of 142978331 in words is "one hundred forty-two million, nine hundred seventy-eight thousand, three hundred thirty-one".