139021139 has 2 divisors, whose sum is σ = 139021140. Its totient is φ = 139021138.

The previous prime is 139021123. The next prime is 139021153. The reversal of 139021139 is 931120931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139021139 - 2⁴ = 139021123 is a prime.

It is a super-3 number, since 3×139021139³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (139021109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69510569 + 69510570.

It is an arithmetic number, because the mean of its divisors is an integer number (69510570).

Almost surely, 2^139021139 is an apocalyptic number.

139021139 is a deficient number, since it is larger than the sum of its proper divisors (1).

139021139 is an equidigital number, since it uses as much as digits as its factorization.

139021139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 139021139 is about 11790.7225817589. The cubic root of 139021139 is about 518.0364049189.

It can be divided in two parts, 13902 and 1139, that multiplied together give a triangular number (15834378 = T₅₆₂₇).

The spelling of 139021139 in words is "one hundred thirty-nine million, twenty-one thousand, one hundred thirty-nine".