139031031 has 8 divisors (see below), whose sum is σ = 188872560. Its totient is φ = 90938432.

The previous prime is 139030979. The next prime is 139031107. The reversal of 139031031 is 130130931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139031031 - 2⁶ = 139030967 is a prime.

It is a super-2 number, since 2×139031031² = 38659255161845922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 139030989 and 139031007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139031131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 437046 + ... + 437363.

It is an arithmetic number, because the mean of its divisors is an integer number (23609070).

Almost surely, 2^139031031 is an apocalyptic number.

139031031 is a deficient number, since it is larger than the sum of its proper divisors (49841529).

139031031 is an equidigital number, since it uses as much as digits as its factorization.

139031031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874465.

The product of its (nonzero) digits is 243, while the sum is 21.

The square root of 139031031 is about 11791.1420566457. The cubic root of 139031031 is about 518.0486915266.

Adding to 139031031 its reverse (130130931), we get a palindrome (269161962).

The spelling of 139031031 in words is "one hundred thirty-nine million, thirty-one thousand, thirty-one".