139864537 has 2 divisors, whose sum is σ = 139864538. Its totient is φ = 139864536.

The previous prime is 139864531. The next prime is 139864573. The reversal of 139864537 is 735468931.

Together with next prime (139864573) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139499721 + 364816 = 11811^2 + 604^2 .

It is a cyclic number.

It is not a de Polignac number, because 139864537 - 2⁷ = 139864409 is a prime.

It is not a weakly prime, because it can be changed into another prime (139864531) 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, 69932268 + 69932269.

It is an arithmetic number, because the mean of its divisors is an integer number (69932269).

Almost surely, 2^139864537 is an apocalyptic number.

It is an amenable number.

139864537 is a deficient number, since it is larger than the sum of its proper divisors (1).

139864537 is an equidigital number, since it uses as much as digits as its factorization.

139864537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 46.

The square root of 139864537 is about 11826.4338242769. The cubic root of 139864537 is about 519.0818821337.

The spelling of 139864537 in words is "one hundred thirty-nine million, eight hundred sixty-four thousand, five hundred thirty-seven".