139537 has 2 divisors, whose sum is σ = 139538. Its totient is φ = 139536.

The previous prime is 139511. The next prime is 139547. The reversal of 139537 is 735931.

It is the 153-rd star number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130321 + 9216 = 361^2 + 96^2 .

It is a cyclic number.

It is not a de Polignac number, because 139537 - 2⁷ = 139409 is a prime.

It is a plaindrome in base 14.

It is a nialpdrome in base 16.

It is a zygodrome in base 16.

It is not a weakly prime, because it can be changed into another prime (139547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69768 + 69769.

It is an arithmetic number, because the mean of its divisors is an integer number (69769).

2¹³⁹⁵³⁷ is an apocalyptic number.

It is an amenable number.

139537 is a deficient number, since it is larger than the sum of its proper divisors (1).

139537 is an equidigital number, since it uses as much as digits as its factorization.

139537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2835, while the sum is 28.

The square root of 139537 is about 373.5465165143. The cubic root of 139537 is about 51.8676367349.

It can be divided in two parts, 1395 and 37, that multiplied together give a palindrome (51615).

The spelling of 139537 in words is "one hundred thirty-nine thousand, five hundred thirty-seven".