142115509 has 4 divisors (see below), whose sum is σ = 144236704. Its totient is φ = 139994316.

The previous prime is 142115507. The next prime is 142115513. The reversal of 142115509 is 905511241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 905511241 = 167 ⋅5422223.

It is a cyclic number.

It is not a de Polignac number, because 142115509 - 2¹ = 142115507 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 (142115507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060497 + ... + 1060630.

It is an arithmetic number, because the mean of its divisors is an integer number (36059176).

Almost surely, 2^142115509 is an apocalyptic number.

It is an amenable number.

142115509 is a deficient number, since it is larger than the sum of its proper divisors (2121195).

142115509 is an equidigital number, since it uses as much as digits as its factorization.

142115509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121194.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 142115509 is about 11921.2209525703. The cubic root of 142115509 is about 521.8517669459.

The spelling of 142115509 in words is "one hundred forty-two million, one hundred fifteen thousand, five hundred nine".