139086817 has 2 divisors, whose sum is σ = 139086818. Its totient is φ = 139086816.

The previous prime is 139086791. The next prime is 139086887. The reversal of 139086817 is 718680931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130507776 + 8579041 = 11424^2 + 2929^2 .

It is a cyclic number.

It is not a de Polignac number, because 139086817 - 2¹⁵ = 139054049 is a prime.

It is not a weakly prime, because it can be changed into another prime (139086887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69543408 + 69543409.

It is an arithmetic number, because the mean of its divisors is an integer number (69543409).

Almost surely, 2^139086817 is an apocalyptic number.

It is an amenable number.

139086817 is a deficient number, since it is larger than the sum of its proper divisors (1).

139086817 is an equidigital number, since it uses as much as digits as its factorization.

139086817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 139086817 is about 11793.5074087398. The cubic root of 139086817 is about 518.1179710239.

The spelling of 139086817 in words is "one hundred thirty-nine million, eighty-six thousand, eight hundred seventeen".