142651809 has 12 divisors (see below), whose sum is σ = 206242452. Its totient is φ = 95013600.

The previous prime is 142651771. The next prime is 142651813. The reversal of 142651809 is 908156241.

It can be written as a sum of positive squares in 2 ways, for example, as 132710400 + 9941409 = 11520^2 + 3153^2 .

It is not a de Polignac number, because 142651809 - 2¹⁶ = 142586273 is a prime.

It is a super-2 number, since 2×142651809² = 40699077221944962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (142651309) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3919 + ... + 17339.

It is an arithmetic number, because the mean of its divisors is an integer number (17186871).

Almost surely, 2^142651809 is an apocalyptic number.

It is an amenable number.

142651809 is a deficient number, since it is larger than the sum of its proper divisors (63590643).

142651809 is a wasteful number, since it uses less digits than its factorization.

142651809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14608 (or 14605 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 142651809 is about 11943.6932730207. The cubic root of 142651809 is about 522.5073786951.

It can be divided in two parts, 1426 and 51809, that added together give a palindrome (53235).

The spelling of 142651809 in words is "one hundred forty-two million, six hundred fifty-one thousand, eight hundred nine".