139123031 has 2 divisors, whose sum is σ = 139123032. Its totient is φ = 139123030.

The previous prime is 139122983. The next prime is 139123037. The reversal of 139123031 is 130321931.

139123031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139123031 - 2¹⁰ = 139122007 is a prime.

It is a super-2 number, since 2×139123031² = 38710435509253922, 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 = 139122988 and 139123006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139123037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69561515 + 69561516.

It is an arithmetic number, because the mean of its divisors is an integer number (69561516).

Almost surely, 2^139123031 is an apocalyptic number.

139123031 is a deficient number, since it is larger than the sum of its proper divisors (1).

139123031 is an equidigital number, since it uses as much as digits as its factorization.

139123031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 139123031 is about 11795.0426451115. The cubic root of 139123031 is about 518.1629345376.

Adding to 139123031 its reverse (130321931), we get a palindrome (269444962).

The spelling of 139123031 in words is "one hundred thirty-nine million, one hundred twenty-three thousand, thirty-one".