1231654139 has 8 divisors (see below), whose sum is σ = 1240201872. Its totient is φ = 1223125920.

The previous prime is 1231654133. The next prime is 1231654153. The reversal of 1231654139 is 9314561321.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231654139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231654099 and 1231654108.

It is not an unprimeable number, because it can be changed into a prime (1231654133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135512 + ... + 144314.

It is an arithmetic number, because the mean of its divisors is an integer number (155025234).

Almost surely, 2^1231654139 is an apocalyptic number.

1231654139 is a deficient number, since it is larger than the sum of its proper divisors (8547733).

1231654139 is an equidigital number, since it uses as much as digits as its factorization.

1231654139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9757.

The product of its digits is 19440, while the sum is 35.

The square root of 1231654139 is about 35094.9303888753. The cubic root of 1231654139 is about 1071.9213561130.

The spelling of 1231654139 in words is "one billion, two hundred thirty-one million, six hundred fifty-four thousand, one hundred thirty-nine".