142091009 has 2 divisors, whose sum is σ = 142091010. Its totient is φ = 142091008.

The previous prime is 142090979. The next prime is 142091017. The reversal of 142091009 is 900190241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141681409 + 409600 = 11903^2 + 640^2 .

It is an emirp because it is prime and its reverse (900190241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142091009 - 2¹² = 142086913 is a prime.

It is not a weakly prime, because it can be changed into another prime (142090009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71045504 + 71045505.

It is an arithmetic number, because the mean of its divisors is an integer number (71045505).

Almost surely, 2^142091009 is an apocalyptic number.

It is an amenable number.

142091009 is a deficient number, since it is larger than the sum of its proper divisors (1).

142091009 is an equidigital number, since it uses as much as digits as its factorization.

142091009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 142091009 is about 11920.1933289691. The cubic root of 142091009 is about 521.8217770146.

It can be divided in two parts, 1420 and 91009, that added together give a palindrome (92429).

The spelling of 142091009 in words is "one hundred forty-two million, ninety-one thousand, nine".