139443001 has 2 divisors, whose sum is σ = 139443002. Its totient is φ = 139443000.

The previous prime is 139442999. The next prime is 139443037. The reversal of 139443001 is 100344931.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107226025 + 32216976 = 10355^2 + 5676^2 .

It is a cyclic number.

It is not a de Polignac number, because 139443001 - 2¹ = 139442999 is a prime.

Together with 139442999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (139443041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69721500 + 69721501.

It is an arithmetic number, because the mean of its divisors is an integer number (69721501).

Almost surely, 2^139443001 is an apocalyptic number.

It is an amenable number.

139443001 is a deficient number, since it is larger than the sum of its proper divisors (1).

139443001 is an equidigital number, since it uses as much as digits as its factorization.

139443001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 139443001 is about 11808.5986044069. The cubic root of 139443001 is about 518.5598725321.

Adding to 139443001 its reverse (100344931), we get a palindrome (239787932).

The spelling of 139443001 in words is "one hundred thirty-nine million, four hundred forty-three thousand, one".