139452091 has 2 divisors, whose sum is σ = 139452092. Its totient is φ = 139452090.

The previous prime is 139452073. The next prime is 139452101. The reversal of 139452091 is 190254931.

It is a strong prime.

It is an emirp because it is prime and its reverse (190254931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139452091 - 2¹⁵ = 139419323 is a prime.

It is not a weakly prime, because it can be changed into another prime (139452011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69726045 + 69726046.

It is an arithmetic number, because the mean of its divisors is an integer number (69726046).

Almost surely, 2^139452091 is an apocalyptic number.

139452091 is a deficient number, since it is larger than the sum of its proper divisors (1).

139452091 is an equidigital number, since it uses as much as digits as its factorization.

139452091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 139452091 is about 11808.9834871593. The cubic root of 139452091 is about 518.5711402348.

The spelling of 139452091 in words is "one hundred thirty-nine million, four hundred fifty-two thousand, ninety-one".