1389559831 has 4 divisors (see below), whose sum is σ = 1515883464. Its totient is φ = 1263236200.

The previous prime is 1389559819. The next prime is 1389559849.

1389559831 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1389559831 - 2¹⁷ = 1389428759 is a prime.

It is a super-2 number, since 2×1389559831² = 3861753047857497122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389559861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63161800 + ... + 63161821.

It is an arithmetic number, because the mean of its divisors is an integer number (378970866).

Almost surely, 2^1389559831 is an apocalyptic number.

1389559831 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1389559831 is a deficient number, since it is larger than the sum of its proper divisors (126323633).

1389559831 is a wasteful number, since it uses less digits than its factorization.

1389559831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126323632.

The product of its digits is 1166400, while the sum is 52.

The square root of 1389559831 is about 37276.8001711520. The cubic root of 1389559831 is about 1115.9012148508.

The spelling of 1389559831 in words is "one billion, three hundred eighty-nine million, five hundred fifty-nine thousand, eight hundred thirty-one".