1231155039 has 16 divisors (see below), whose sum is σ = 1667832320. Its totient is φ = 807693120.

The previous prime is 1231154999. The next prime is 1231155053. The reversal of 1231155039 is 9305511321.

It is not a de Polignac number, because 1231155039 - 2⁸ = 1231154783 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231154997 and 1231155015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231155539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64299 + ... + 81219.

It is an arithmetic number, because the mean of its divisors is an integer number (104239520).

Almost surely, 2^1231155039 is an apocalyptic number.

1231155039 is a deficient number, since it is larger than the sum of its proper divisors (436677281).

1231155039 is a wasteful number, since it uses less digits than its factorization.

1231155039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17310.

The product of its (nonzero) digits is 4050, while the sum is 30.

The square root of 1231155039 is about 35087.8189547313. The cubic root of 1231155039 is about 1071.7765459174.

The spelling of 1231155039 in words is "one billion, two hundred thirty-one million, one hundred fifty-five thousand, thirty-nine".