139530991 has 2 divisors, whose sum is σ = 139530992. Its totient is φ = 139530990.

The previous prime is 139530971. The next prime is 139531013. The reversal of 139530991 is 199035931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139530991 - 2⁷ = 139530863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139530961) 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, 69765495 + 69765496.

It is an arithmetic number, because the mean of its divisors is an integer number (69765496).

Almost surely, 2^139530991 is an apocalyptic number.

139530991 is a deficient number, since it is larger than the sum of its proper divisors (1).

139530991 is an equidigital number, since it uses as much as digits as its factorization.

139530991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32805, while the sum is 40.

The square root of 139530991 is about 11812.3236918059. The cubic root of 139530991 is about 518.6689218425.

The spelling of 139530991 in words is "one hundred thirty-nine million, five hundred thirty thousand, nine hundred ninety-one".