142181777 has 2 divisors, whose sum is σ = 142181778. Its totient is φ = 142181776.

The previous prime is 142181723. The next prime is 142181783. The reversal of 142181777 is 777181241.

It is a Cunningham number, because it is equal to 11924²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142181776 + 1 = 11924^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 142181777 - 2¹⁴ = 142165393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 142181777.

It is not a weakly prime, because it can be changed into another prime (142181797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71090888 + 71090889.

It is an arithmetic number, because the mean of its divisors is an integer number (71090889).

Almost surely, 2^142181777 is an apocalyptic number.

It is an amenable number.

142181777 is a deficient number, since it is larger than the sum of its proper divisors (1).

142181777 is an equidigital number, since it uses as much as digits as its factorization.

142181777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21952, while the sum is 38.

The square root of 142181777 is about 11924.0000419322. Note that the first 4 decimals coincide. The cubic root of 142181777 is about 521.9328669360.

It can be divided in two parts, 14218 and 1777, that multiplied together give a triangular number (25265386 = T₇₁₀₈).

The spelling of 142181777 in words is "one hundred forty-two million, one hundred eighty-one thousand, seven hundred seventy-seven".