142451309 has 32 divisors (see below), whose sum is σ = 193294080. Its totient is φ = 101376000.

The previous prime is 142451273. The next prime is 142451317. The reversal of 142451309 is 903154241.

It is not a de Polignac number, because 142451309 - 2²⁰ = 141402733 is a prime.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142451329) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100397 + ... + 101805.

It is an arithmetic number, because the mean of its divisors is an integer number (6040440).

Almost surely, 2^142451309 is an apocalyptic number.

It is an amenable number.

142451309 is a deficient number, since it is larger than the sum of its proper divisors (50842771).

142451309 is a wasteful number, since it uses less digits than its factorization.

142451309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 142451309 is about 11935.2967705039. The cubic root of 142451309 is about 522.2624656897.

The spelling of 142451309 in words is "one hundred forty-two million, four hundred fifty-one thousand, three hundred nine".