139366081 has 2 divisors, whose sum is σ = 139366082. Its totient is φ = 139366080.

The previous prime is 139366069. The next prime is 139366091. The reversal of 139366081 is 180663931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123565456 + 15800625 = 11116^2 + 3975^2 .

It is a cyclic number.

It is not a de Polignac number, because 139366081 - 2¹⁹ = 138841793 is a prime.

It is a super-2 number, since 2×139366081² = 38845809066597122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 139366081.

It is not a weakly prime, because it can be changed into another prime (139366001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69683040 + 69683041.

It is an arithmetic number, because the mean of its divisors is an integer number (69683041).

Almost surely, 2^139366081 is an apocalyptic number.

It is an amenable number.

139366081 is a deficient number, since it is larger than the sum of its proper divisors (1).

139366081 is an equidigital number, since it uses as much as digits as its factorization.

139366081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 139366081 is about 11805.3412064201. The cubic root of 139366081 is about 518.4645051020.

The spelling of 139366081 in words is "one hundred thirty-nine million, three hundred sixty-six thousand, eighty-one".