145642139 has 2 divisors, whose sum is σ = 145642140. Its totient is φ = 145642138.

The previous prime is 145642033. The next prime is 145642151. The reversal of 145642139 is 931246541.

145642139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145642139 - 2⁸ = 145641883 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 145642099 and 145642108.

It is not a weakly prime, because it can be changed into another prime (145642339) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72821069 + 72821070.

It is an arithmetic number, because the mean of its divisors is an integer number (72821070).

Almost surely, 2^145642139 is an apocalyptic number.

145642139 is a deficient number, since it is larger than the sum of its proper divisors (1).

145642139 is an equidigital number, since it uses as much as digits as its factorization.

145642139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The square root of 145642139 is about 12068.2284946880. The cubic root of 145642139 is about 526.1331702218.

The spelling of 145642139 in words is "one hundred forty-five million, six hundred forty-two thousand, one hundred thirty-nine".