142820551 has 2 divisors, whose sum is σ = 142820552. Its totient is φ = 142820550.

The previous prime is 142820539. The next prime is 142820567. The reversal of 142820551 is 155028241.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 142820551 - 2²⁵ = 109266119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142827551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71410275 + 71410276.

It is an arithmetic number, because the mean of its divisors is an integer number (71410276).

Almost surely, 2^142820551 is an apocalyptic number.

142820551 is a deficient number, since it is larger than the sum of its proper divisors (1).

142820551 is an equidigital number, since it uses as much as digits as its factorization.

142820551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 142820551 is about 11950.7552481004. The cubic root of 142820551 is about 522.7133211660.

Adding to 142820551 its reverse (155028241), we get a palindrome (297848792).

The spelling of 142820551 in words is "one hundred forty-two million, eight hundred twenty thousand, five hundred fifty-one".