142787231 has 2 divisors, whose sum is σ = 142787232. Its totient is φ = 142787230.

The previous prime is 142787221. The next prime is 142787263. The reversal of 142787231 is 132787241.

It is a weak prime.

It is an emirp because it is prime and its reverse (132787241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142787231 - 2⁶ = 142787167 is a prime.

It is a super-2 number, since 2×142787231² = 40776386673294722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 142787191 and 142787200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142787221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71393615 + 71393616.

It is an arithmetic number, because the mean of its divisors is an integer number (71393616).

Almost surely, 2^142787231 is an apocalyptic number.

142787231 is a deficient number, since it is larger than the sum of its proper divisors (1).

142787231 is an equidigital number, since it uses as much as digits as its factorization.

142787231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18816, while the sum is 35.

The square root of 142787231 is about 11949.3611126286. The cubic root of 142787231 is about 522.6726683740.

The spelling of 142787231 in words is "one hundred forty-two million, seven hundred eighty-seven thousand, two hundred thirty-one".