142978081 has 2 divisors, whose sum is σ = 142978082. Its totient is φ = 142978080.

The previous prime is 142978039. The next prime is 142978093. The reversal of 142978081 is 180879241.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87609600 + 55368481 = 9360^2 + 7441^2 .

It is an emirp because it is prime and its reverse (180879241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142978081 - 2²³ = 134589473 is a prime.

It is a super-2 number, since 2×142978081² = 40885463292885122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (142978481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71489040 + 71489041.

It is an arithmetic number, because the mean of its divisors is an integer number (71489041).

Almost surely, 2^142978081 is an apocalyptic number.

It is an amenable number.

142978081 is a deficient number, since it is larger than the sum of its proper divisors (1).

142978081 is an equidigital number, since it uses as much as digits as its factorization.

142978081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 142978081 is about 11957.3442285484. The cubic root of 142978081 is about 522.9054335123.

The spelling of 142978081 in words is "one hundred forty-two million, nine hundred seventy-eight thousand, eighty-one".