142149409 has 2 divisors, whose sum is σ = 142149410. Its totient is φ = 142149408.

The previous prime is 142149401. The next prime is 142149421. The reversal of 142149409 is 904941241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132365025 + 9784384 = 11505^2 + 3128^2 .

It is a cyclic number.

It is not a de Polignac number, because 142149409 - 2³ = 142149401 is a prime.

It is not a weakly prime, because it can be changed into another prime (142149401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71074704 + 71074705.

It is an arithmetic number, because the mean of its divisors is an integer number (71074705).

Almost surely, 2^142149409 is an apocalyptic number.

It is an amenable number.

142149409 is a deficient number, since it is larger than the sum of its proper divisors (1).

142149409 is an equidigital number, since it uses as much as digits as its factorization.

142149409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 142149409 is about 11922.6427020187. The cubic root of 142149409 is about 521.8932575347.

The spelling of 142149409 in words is "one hundred forty-two million, one hundred forty-nine thousand, four hundred nine".