139609537 has 2 divisors, whose sum is σ = 139609538. Its totient is φ = 139609536.

The previous prime is 139609531. The next prime is 139609571. The reversal of 139609537 is 735906931.

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., 115756081 + 23853456 = 10759^2 + 4884^2 .

It is a cyclic number.

It is not a de Polignac number, because 139609537 - 2¹⁹ = 139085249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 139609493 and 139609502.

It is not a weakly prime, because it can be changed into another prime (139609531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69804768 + 69804769.

It is an arithmetic number, because the mean of its divisors is an integer number (69804769).

Almost surely, 2^139609537 is an apocalyptic number.

It is an amenable number.

139609537 is a deficient number, since it is larger than the sum of its proper divisors (1).

139609537 is an equidigital number, since it uses as much as digits as its factorization.

139609537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 153090, while the sum is 43.

The square root of 139609537 is about 11815.6479720750. The cubic root of 139609537 is about 518.7662281273.

The spelling of 139609537 in words is "one hundred thirty-nine million, six hundred nine thousand, five hundred thirty-seven".