145542139 has 2 divisors, whose sum is σ = 145542140. Its totient is φ = 145542138.

The previous prime is 145542101. The next prime is 145542197. The reversal of 145542139 is 931245541.

It is a weak prime.

It is an emirp because it is prime and its reverse (931245541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145542139 - 2¹⁷ = 145411067 is a prime.

It is equal to p_8207377 and since 145542139 and 8207377 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (145542739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72771069 + 72771070.

It is an arithmetic number, because the mean of its divisors is an integer number (72771070).

Almost surely, 2^145542139 is an apocalyptic number.

145542139 is a deficient number, since it is larger than the sum of its proper divisors (1).

145542139 is an equidigital number, since it uses as much as digits as its factorization.

145542139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 34.

The square root of 145542139 is about 12064.0846731113. The cubic root of 145542139 is about 526.0127257688.

The spelling of 145542139 in words is "one hundred forty-five million, five hundred forty-two thousand, one hundred thirty-nine".