139385537 has 2 divisors, whose sum is σ = 139385538. Its totient is φ = 139385536.

The previous prime is 139385507. The next prime is 139385551. The reversal of 139385537 is 735583931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137147521 + 2238016 = 11711^2 + 1496^2 .

It is a cyclic number.

It is not a de Polignac number, because 139385537 - 2¹² = 139381441 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139385507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69692768 + 69692769.

It is an arithmetic number, because the mean of its divisors is an integer number (69692769).

Almost surely, 2^139385537 is an apocalyptic number.

It is an amenable number.

139385537 is a deficient number, since it is larger than the sum of its proper divisors (1).

139385537 is an equidigital number, since it uses as much as digits as its factorization.

139385537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 340200, while the sum is 44.

The square root of 139385537 is about 11806.1652114478. The cubic root of 139385537 is about 518.4886304750.

The spelling of 139385537 in words is "one hundred thirty-nine million, three hundred eighty-five thousand, five hundred thirty-seven".