139333531 has 2 divisors, whose sum is σ = 139333532. Its totient is φ = 139333530.

The previous prime is 139333507. The next prime is 139333583. The reversal of 139333531 is 135333931.

139333531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (135333931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139333531 - 2¹¹ = 139331483 is a prime.

It is a super-2 number, since 2×139333531² = 38827665721855922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 139333493 and 139333502.

It is not a weakly prime, because it can be changed into another prime (139333331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69666765 + 69666766.

It is an arithmetic number, because the mean of its divisors is an integer number (69666766).

Almost surely, 2^139333531 is an apocalyptic number.

139333531 is a deficient number, since it is larger than the sum of its proper divisors (1).

139333531 is an equidigital number, since it uses as much as digits as its factorization.

139333531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10935, while the sum is 31.

The square root of 139333531 is about 11803.9625126480. The cubic root of 139333531 is about 518.4241381932.

The spelling of 139333531 in words is "one hundred thirty-nine million, three hundred thirty-three thousand, five hundred thirty-one".