142626509 has 4 divisors (see below), whose sum is σ = 142653660. Its totient is φ = 142599360.

The previous prime is 142626503. The next prime is 142626511. The reversal of 142626509 is 905626241.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16176484 + 126450025 = 4022^2 + 11245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142626509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142626503) 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 in 3 ways as a sum of consecutive naturals, for example, 2894 + ... + 17135.

It is an arithmetic number, because the mean of its divisors is an integer number (35663415).

Almost surely, 2^142626509 is an apocalyptic number.

It is an amenable number.

142626509 is a deficient number, since it is larger than the sum of its proper divisors (27151).

142626509 is an equidigital number, since it uses as much as digits as its factorization.

142626509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27150.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 142626509 is about 11942.6340896806. The cubic root of 142626509 is about 522.4764871176.

The spelling of 142626509 in words is "one hundred forty-two million, six hundred twenty-six thousand, five hundred nine".