139089421 has 2 divisors, whose sum is σ = 139089422. Its totient is φ = 139089420.

The previous prime is 139089389. The next prime is 139089439. The reversal of 139089421 is 124980931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138980521 + 108900 = 11789^2 + 330^2 .

It is a cyclic number.

It is not a de Polignac number, because 139089421 - 2⁵ = 139089389 is a prime.

It is a super-3 number, since 3×139089421³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139089451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69544710 + 69544711.

It is an arithmetic number, because the mean of its divisors is an integer number (69544711).

Almost surely, 2^139089421 is an apocalyptic number.

It is an amenable number.

139089421 is a deficient number, since it is larger than the sum of its proper divisors (1).

139089421 is an equidigital number, since it uses as much as digits as its factorization.

139089421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 139089421 is about 11793.6178079502. The cubic root of 139089421 is about 518.1212044259.

The spelling of 139089421 in words is "one hundred thirty-nine million, eighty-nine thousand, four hundred twenty-one".